Fix typo in FK name in VPNaaS DB schema migration

Applying of migration 52ff27f7567a fails due to the typo
in a table name referenced by a FK ('ipsecsiteonnections'
instead of 'ipsec_site_connections').

Fixes bug 1207811

Change-Id: I9ee2933660c92d095db91003671478e691acecb1
Remove status* fields from HealthMonitor model

Status and status_description fields of HealthMonitor
model are never changed during lifetime of the object
and doesn't represent the status of it's pysical
implementation. Instead, status and status_description
of PoolMonitorAssociation is used. Another reason for
removing those fields is that HealthMonitor acts as
template which is instantiated on device. Status field
for template makes no sense.

fixes bug 1207650

Change-Id: Iea9d7f73c3a2db43c553ed06a64fe5ff42427167
Merge "Fix typo in FK name in VPNaaS DB schema migration"
Merge "Remove status* fields from HealthMonitor model"