There as an invalid key in the command dict that would cause failure
using prompts. This changes the key from response to answer which is
what is expected by network_cli
* updates all iosxr modules to support persistent socket
* adds iosxr action plugin to connect to device
* adds exec_command() to iosxr shared module
* fixes iosxr_config and iosxr_template local action
* update all unit test cases
* adds base test module for iosxr module testing
* removes connection functions refactored into connection
* updates ComplexDict and ComplexList objects to use with AnsibleModule
* updates modules to add new argument to ComplexList & ComplexDict
* commands argument now accepts a dict arguments[1]
* waitfor has been renamed to wait_for with an alias to waitfor
* only show commands are allowd when check mode is specified
* config mode is no longer allowed in the command stack
* add argument match with valid values any, all
[1] The commands argument will now accept a dict argument that can
specifiy the output format of the command. To specify a dict argument
use the form of { command: <str>, output: <str>, prompt: <str>,
response: <str> }.