When deleting HA routers, the keepalived state change monitor has to be
deleted. This patch adds rootwrap filters to allow deleting the state
change monitor.
Change-Id: Icfb208d9b51eaa41cf01af81f1ede7420a19cc93
Partial-Bug: #1795870
Partial-Bug: #1789434
(cherry picked from commit 25c432a05a)