* Fix CNOS unit test log usage.
* Use temp dir for Galaxy unit tests.
* Write to temp files in interfaces_file unit test.
* Fix log placement in netapp_e_ldap unit test.
* CNOS Vlag module is refactored to use persistence connection instead of paramiko.
* Changing interface and port channel modules to persistent connection and adding UT for them.
* Fixing pep8 issues
* Removing trailing new line
* Removing trailing new line
* Removing trailing new line
* Correcting indentation mistake
* Update cnos_vlag.py
* Removing commented examples
They are commented because those configurations are not meant for L2 ports
