The service account used by the Octavia health manager pod lacks
the proper Role and Role Bindings. These are generated by specifying
the static correct static dependency key when creating the respective
service account.
This commit specifies that the health_manager key must be used so
that proper Role and Role Binding are created.
Change-Id: Ib66fb822edd03c8f67642f4791efb75985d5dc44
bcdcd7de35