* Improving of nxos_ip_interface module
Added features:
* Route tags for an IP address at interface level with 'tag' option
* Support of IPv4 secondary addresses if option 'allow_secondary' is
true (false by default). If option 'allow_secondary' is true primary
IPv4 address will be replaced
All features support NXAPI and CLI transport, but only with text/raw
output. Currently not possible to get route tags for secondary IPv4/IPv6
addresses from JSON output.
Other changes:
* Module return state 'changed' only when configuration commands were
executed
* Module result includes multiple prefixes if IPv4 addresses were
found
* Fix PEP8 issues
* Addition fix of PEP8 issues
* Remove unused variable from main()
* Fix "proposed" sample in RETURN variable
* Fix "existing" sample in RETURN variable
* Update RETURN variable
Add 'secondary' for every element of 'addresses' list.
* Restore old version number
* Added exception when ipaddress module is imported
* DOCUMENTATION string was updated
* Added 'version_added' for new features
* Added 'requirements' for module
* Added compatibility with latest commit in devel branch
* DOCUMENTATION was fixed
* Improve changes of route tag for existing ip addresses
* Added compatibility with core code
* Fixed mistypes in the DOCUMENTATION variable
* argument_spec fixed
allow_secondary argument type was changed according to allowed choices.