Rename and add more functionality to maas tool

This change renames check_maas_plugins.py to rpc_maas_tool.py and adds
some functionality to mass delete checks and to print open alarms.
This is useful for a prod environments where you want to quickly see
what is currently down or for test environments where you need to
quickly delete all checks.
Merge pull request #117 from mattt416/update_maas_tool

Rename and add more functionality to maas tool