Integrate Marathon BIG-IP Controller to use CCCL and CCCL Schema

[edarzins]

Changes to the marathon-bigip-ctlr:

• Creation of a CCCL instance for each managed partition
• Removed wildcard partition argument
• Modification of method create_config_marathon() to create a service description consistent with the CCCL schema
• Support multiple monitors for pools
• Conversion of unit tests to focus on Marathon-specific functions and defer unit testing of BIG-IP resources to CCCL
• Moved common.py from the CCCL repo to this repo because it mostly contained Marathon-specific functions
• Configuration of root logger to properly log CCCL messages

Status:

• All unit tests PASS
• All functional tests PASS