* NXAPI ssl ciphers & protocols default values
* TLSv1, TLSv1.1, TLSv1.2 and weak cipher support
* NXOS NXAPI weak/strong cipher & TLSv 1.2, 1.1 & 1.0 support
* Version checking for strong/weak ciphers & TLS 1.2, 1.1 & 1.0 support
* Cleaned up erroneously committed changes.
* Specific NXOS platform checking for nxapi ssl ciphers & protocols
* Fixed ansibot reported errors.
* Resolved ansibot reported error.
* Added network_os_version to mocked up N7K unit test device_info
* Calling get_capabilities() once in main and passing results into methods.
* Removed raising exceptions when platform capabilities return None
per reviewers request. Skipping nxapi ssl options when capabilities
are None and generating a warning when these options are skipped
* Cleaned up explicit checks for None/not None
