* add module to create aci VMM credential objects
add initial remove and add integration tests for VMM credential objects
* update 'credential' var name to 'name'
* move vmware tests to domain type specific file
* move vmware tests to domain type specific file
add include task in main file to reference domain type specific tests
* update task names
add test to remove credential prior to first credential add
add tests for querying individual credentials
add tests for query all credentials
add additional tests for removing credentials
* update version added to 2.9
remove invalid module references from 'seealso' section
* fix list reference in query all assertions
* add reference to VM_PROVIDER_MAPPING keys for vm_provider arg
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