refactor

[badra001]

• add new_list_hosted_zones_by_vpc(), get_caller_partition(), prep for flags
• update code for testing of by_vpc zone getting
• use session vs client
• fix partition
• add more to by_vpc code
• add _collection_by_vpc()
• add _collection_by_vpc()
• fix
• use global session, setup sessions outside of handler
• update globals
• move initialize
• change to use archive
• bump
• fix
• update to tf 1.x
• replace the reverse zone code
• replace the reverse zone code
• add traililng dot to reverse
• change tag processing for hostname/zone looups
• add tags processing for flags, prep for cname,zone,name
• start with the assume role code
• make phz global, add some debugging
• add more debug
• promote to 2.0.0