Sync a rootwrap KillFilter fix from oslo-incubator
Sync a rootwrap KillFilter fix from oslo-incubator

Syncs:

  ea78eec Update KillFilter to stop at '\0' for readlink() function.

Change-Id: Id0fa6408b208639e658da337299b390eba5c70f4

rdo-management/tuskar,rdo-management/tuskar,rdo-management/tuskar,tuskar/tuskar