[systest] Nova-compute service status not updated after environment revert

[Vladimir Kuklin]

After environment snapshot revert in system tests, sometimes nova-compute does not update service status. Research shows that there are some bugs in looping call task created by nova-compute service. Currently only nova-compute service restart can help to make nova-compute work again. We need to investigate it as it introduces false positive system tests results.

[Tatyanka (tatyana-leontovich)]

Also after revert HA env in sys tests - galera is broken
And httpd proxy sometimes:
2013-12-16T06:03:48.998842+00:00 debug: [debug] mod_proxy_http.c(1456): [client 10.108.26.2] proxy: NOT Closing connection to client although reading from backend server 10.108.27.2 failed.
2013-12-16T06:03:48.998894+00:00 err: [error] [client 10.108.26.2] proxy: Error reading from remote server returned by http://10.108.27.2:5000/v2.0/tokens
2013-12-16T06:03:48.998894+00:00 debug: [debug] proxy_util.c(2029): proxy: HTTP: has released connection for (*)
2013-12-16T06:03:49.057584+00:00 err: [error] [client 10.108.26.2] (70007)The timeout specified has expired: proxy: error reading status line from remote server 10.108.27.2
2013-12-16T06:03:49.057584+00:00 debug: [debug] mod_proxy_http.c(1405): [client 10.108.26.2] proxy: read timeout
2013-12-16T06:03:49.057619+00:00 debug: [debug] mod_proxy_http.c(1456): [client 10.108.26.2] proxy: NOT Closing connection to client although reading from backend server 10.108.27.2 failed.
2013-12-16T06:03:49.057619+00:00 err: [error] [client 10.108.26.2] proxy: Error reading from remote server returned by http://10.108.27.2:5000/v2.0/tokens

So may be need to deleted revert environment for HA tests

[Tatyanka (tatyana-leontovich)]

Revert from snapshot was deleted in the tests - so such problems disapear