Allows unlinking symlinked plugins on removal
Allows unlinking symlinked plugins on removal

This fixes the bug where ir plugin remove fails if plugin
folders are symlinks.

Change-Id: Ic1e1bd239023e42a4e6be6964f56ad0669c201b2

okolisny/InfraRed,redhat-openstack/infrared,okolisny/InfraRed,okolisny/InfraRed,redhat-openstack/infrared,redhat-openstack/infrared