Revert libvirt change in heka-openstack.toml.j2 in master

This is consistent with the patch set in
https://review.openstack.org/#/c/296012/ for stable/mitaka

The new lua parser for libvirtd.log so that libvirtd.log can be
parsed in the Kibana dashboard will be implemented in a separate
patch set (in both master and backported to Mitaka).

TrivialFix

Related-Bug: 1560298
Related-Id: I1bc8bdb3180f30dc69af28a35fa057ac801bde0f
Change-Id: I59938a4e99abc676c391e535405417701aae2767

ansible/roles/common/templates/heka-openstack.toml.j2

@@ -6,6 +6,6 @@ filename = "lua_decoders/os_openstack_log.lua"
 type = "LogstreamerInput"
 decoder = "openstack_log_decoder"
 log_directory = "/var/log/kolla"
-file_match = '(?P<Service>nova|glance|keystone|neutron|cinder|heat|murano|magnum|mistral|manila|libvirtd)/(?P<Program>.*)\.log\.?(?P<Seq>\d*)$'
+file_match = '(?P<Service>nova|glance|keystone|neutron|cinder|heat|murano|magnum|mistral|manila)/(?P<Program>.*)\.log\.?(?P<Seq>\d*)$'
 priority = ["^Seq"]
 differentiator = ["Service", "_", "Program"]