Help information for lbaasV2 Update CLIs lack several options
( Refer bug#1515111 ). This patch adds all the options which
are missing in the "neutron lbaas-*-update " CLIs
Also updated is the --http-method for HealthMonitor,
making it case in-sensitive.
This also adds update of --default-pool for L7 support.
Change-Id: If859dc899efa92173c7a654e3f1481b35790faaa
Closes-Bug: #1515111
Closes-Bug: #1523968