test/system: Shorten the names of the tests and use consistent wording

Currently, some of the names of the tests were too long, and had
inconsistent and verbose wording.  This made it difficult to look at
them and get a gist of all the scenarios being tested.  The names are
like headings.  They shouldn't be too long, should capture the primary
objective of the test and be consistent in their wording.

Note that the term 'usage screen' was particularly confusing.  Prior to
commit 3dc106e10a, 'usage screen' in the names of the tests also
referred to the very brief listing of the commands and options that's
shown by 'toolbox help' and 'toolbox --help' in the absence of man(1).
In the context of this change, the term referred to the brief two line
error message that's shown when an unknown command or flag is used.  So,
it will be good to not use it anymore.

https://github.com/containers/toolbox/pull/1386

test/system/002-help.bats

@@ -23,7 +23,7 @@ setup() {
   _setup_environment
 }
 
-@test "help: Try to run toolbox with no command" {
+@test "help: Smoke test" {
   run --keep-empty-lines --separate-stderr "$TOOLBOX"
 
   assert_failure
@@ -37,9 +37,9 @@ setup() {
   assert [ ${#stderr_lines[@]} -eq 7 ]
 }
 
-@test "help: Run command 'help'" {
+@test "help: Command 'help'" {
   if ! command -v man 2>/dev/null; then
-    skip "Test works only if man is in PATH"
+    skip "not found man(1)"
   fi
 
   run --keep-empty-lines --separate-stderr "$TOOLBOX" help
@@ -52,9 +52,9 @@ setup() {
   assert [ ${#stderr_lines[@]} -eq 0 ]
 }
 
-@test "help: Run command 'help' with no man present" {
+@test "help: Command 'help' with man(1) absent" {
   if command -v man 2>/dev/null; then
-    skip "Test works only if man is not in PATH"
+    skip "found man(1)"
   fi
 
   run --keep-empty-lines --separate-stderr "$TOOLBOX" help
@@ -70,7 +70,7 @@ setup() {
   assert [ ${#stderr_lines[@]} -eq 0 ]
 }
 
-@test "help: Use flag '--help'" {
+@test "help: Flag '--help'" {
   if ! command -v man 2>/dev/null; then
     skip "not found man(1)"
   fi
@@ -85,7 +85,7 @@ setup() {
   assert [ ${#stderr_lines[@]} -eq 0 ]
 }
 
-@test "help: Use flag '--help' with man(1) absent" {
+@test "help: Flag '--help' with man(1) absent" {
   if command -v man 2>/dev/null; then
     skip "found man(1)"
   fi
@@ -110,7 +110,7 @@ setup() {
   assert [ ${#stderr_lines[@]} -eq 0 ]
 }
 
-@test "help: Try to run toolbox with non-existent command (shows usage screen)" {
+@test "help: Try unknown command" {
   run --keep-empty-lines --separate-stderr "$TOOLBOX" foo
 
   assert_failure
@@ -121,7 +121,7 @@ setup() {
   assert [ ${#stderr_lines[@]} -eq 2 ]
 }
 
-@test "help: Try to run toolbox with non-existent flag (shows usage screen)" {
+@test "help: Try unknown flag" {
   run --keep-empty-lines --separate-stderr "$TOOLBOX" --foo
 
   assert_failure
@@ -132,7 +132,7 @@ setup() {
   assert [ ${#stderr_lines[@]} -eq 2 ]
 }
 
-@test "help: Try to run 'toolbox create' with non-existent flag (shows usage screen)" {
+@test "help: Try 'create' with unknown flag" {
   run --keep-empty-lines --separate-stderr "$TOOLBOX" create --foo
 
   assert_failure
@@ -143,7 +143,7 @@ setup() {
   assert [ ${#stderr_lines[@]} -eq 2 ]
 }
 
-@test "help: Try to run 'toolbox enter' with non-existent flag (shows usage screen)" {
+@test "help: Try 'enter' with unknown flag" {
   run --keep-empty-lines --separate-stderr "$TOOLBOX" enter --foo
 
   assert_failure
@@ -154,7 +154,7 @@ setup() {
   assert [ ${#stderr_lines[@]} -eq 2 ]
 }
 
-@test "help: Try to run 'toolbox help' with non-existent flag (shows usage screen)" {
+@test "help: Try 'help' with unknown flag" {
   run --keep-empty-lines --separate-stderr "$TOOLBOX" help --foo
 
   assert_failure
@@ -165,7 +165,7 @@ setup() {
   assert [ ${#stderr_lines[@]} -eq 2 ]
 }
 
-@test "help: Try to run 'toolbox init-container' with non-existent flag (shows usage screen)" {
+@test "help: Try 'init-container' with unknown flag" {
   run --keep-empty-lines --separate-stderr "$TOOLBOX" init-container --foo
 
   assert_failure
@@ -176,7 +176,7 @@ setup() {
   assert [ ${#stderr_lines[@]} -eq 2 ]
 }
 
-@test "help: Try to run 'toolbox list' with non-existent flag (shows usage screen)" {
+@test "help: Try 'list' with unknown flag" {
   run --keep-empty-lines --separate-stderr "$TOOLBOX" list --foo
 
   assert_failure
@@ -187,7 +187,7 @@ setup() {
   assert [ ${#stderr_lines[@]} -eq 2 ]
 }
 
-@test "help: Try to run 'toolbox rm' with non-existent flag (shows usage screen)" {
+@test "help: Try 'rm' with unknown flag" {
   run --keep-empty-lines --separate-stderr "$TOOLBOX" rm --foo
 
   assert_failure
@@ -198,7 +198,7 @@ setup() {
   assert [ ${#stderr_lines[@]} -eq 2 ]
 }
 
-@test "help: Try to run 'toolbox rmi' with non-existent flag (shows usage screen)" {
+@test "help: Try 'rmi' with unknown flag" {
   run --keep-empty-lines --separate-stderr "$TOOLBOX" rmi --foo
 
   assert_failure
@@ -209,7 +209,7 @@ setup() {
   assert [ ${#stderr_lines[@]} -eq 2 ]
 }
 
-@test "help: Try to run 'toolbox run' with non-existent flag (shows usage screen)" {
+@test "help: Try 'run' with unknown flag" {
   run --keep-empty-lines --separate-stderr "$TOOLBOX" run --foo
 
   assert_failure