* nmcli: add idemptent support for any kinds of connections
Fixes#481: nmcli reports changed status even if nothing needs to change
- Implement show_connection() to retrieve connection profile from command line
- Parse integer enumeration values in show_connection()
- Convert 'bond.options' to alias shortcuts
- Modify connection only if changes are detected
- Support generic alias in during the property comparison
* nmcli: add idemptent support for any kinds of connections
Add mock object for modification cases when connection state changes
* nmcli: add idempotent support for any kinds of connections
- Add more test cases to check idempotent for each type of connections
- Verify 'changed' and 'failed' in the result of each test
- Append prefixlen for 'ip4' values in test data
- Fix the incorrect 'return_value' of execute_command() in previous mockers
- Ignore the empty string in _compare_conn_params()
- Fix the property key mapping of 'bridge-port.hairpin-mode' for bridge-slave
- Add 'override_options' in the result output for playboot debug
* nmcli: add idempotent support for any kinds of connections
Fix pep8 issues in test_nmcli.py: Comparison to False should be 'not expr'
* nmcli: add idempotent support for any kinds of connections
Support setting 'ipv4.method' or 'ipv6.method' via nmcli if the configuration method changes
* nmcli: add idempotent support for any kinds of connections
Simplify the if statements in show_connection() according to vlours's advice
* nmcli: add idempotent support for any kinds of connections
Fix the list argument comparison method with multiple values.
* nmcli: add idempotent support for any kinds of connections
Use ansible --diff option output to show detailed changes instead of a private return value.
* nmcli: add idempotent support for any kinds of connections
Add changelog fragment for bugfix.
