Add QoS and Interface modules, fix bugs and docs

A restructuring has been done to interface modules to
allow for configuration of interface admin state and
other interface specific configurations in the
aoscx_interface module. Inclusion of QoS specific configurations
is added to new modules and existing interface module.

This commit:
- fix documentation for various modules
- fix idempotency for ACL Entries and VLANs
- restructures interface modules
- includes QoS modules

New modules included are:
- aoscx_interface
- aoscx_qos
- aoscx_qos_cos
- aoscx_qos_dscp
- aoscx_queue
- aoscx_queue_profile
- aoscx_queue_profile_entry
- aoscx_system

ACL Bug fixes and Doc improvements

• Improves documentation on access-lists to dive deeper
  into feature functionality and parameter values
• Fixes modifying ACE functionality and idempotency
• Fixes ACE option handling

Restructures to use Pyaoscx, adds VSX

• Modifies the backend of the AOS-CX role to utilize the
  Pyaoscx package found here:
  https://pypi.org/project/pyaoscx
• Adds new modules for configuring VSX
• Requires pyaoscx v2 Python package
• Previous implementation still supported for legacy modules

bug fixes

• bug fixes with sorting algorithm for aoscx_backup_config

adds nested Sorting capability for JSON config

• adds sorting function to module_utils/aoscx.py
• adds additional parameter to flag whether or not to sort

2.10 Compatible Release

fixes import and requirements for 2.10

• modifies module plugin import to work with Ansible 2.10
• includes Ansible and Python requirements files
• updates README with requirements

Static Route Module Bug Fix

• Fixes a bug in static route module aoscx_static_route.py

Bug fixes and code reformatting

• fixes VRF and L3 interface behavior on 10.4
• adds handling for paging to allow multi page output
• fixes bug seen with ZTP backend functionality
• fixes minor documentation errors
• formats modules to pass ansible-test sanity

Adds logic for initial password handling

• Beginning 10.4 AOS-CX requires an admin password to
  be set when first logging into the switch
• These changes allow for the initial password to be set
  via REST API and SSH modules

New Modules and Bug fixes

This release includes new modules that allow for SSH/CLI commands and configuration. Refer to module documentation found in docs/.

New Modules

• aoscx_command - This module connects to the CX device via SSH and allows CLI commands to be executed.
• aoscx_config - This module connects to the CX device via SSH and allows CLI configuration commands to be executed.
• aoscx_facts - This module used REST API to retrieve a subset of information from the CX device.

Known Issues

• To use the aoscx_facts module, the device must be running firmware version 10.4 or higher.