Add missing parameters to test config
Add missing parameters to test config

The install_image and compression_tools parameters were missing from
the test cluster config for 2.12, and this patch adds them there.

Signed-off-by: Hrvoje Ribicic <be5828fca31f89218048bec4189e30a581aa65da@google.com>
Reviewed-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>

mbakke/ganeti,bitemyapp/ganeti,andir/ganeti,andir/ganeti,onponomarev/ganeti,yiannist/ganeti,apyrgio/ganeti,leshchevds/ganeti,leshchevds/ganeti,dimara/ganeti,bitemyapp/ganeti,mbakke/ganeti,mbakke/ganeti,grnet/snf-ganeti,onponomarev/ganeti,yiannist/ganeti,ganeti-github-testing/ganeti-test-1,leshchevds/ganeti,apyrgio/ganeti,yiannist/ganeti,andir/ganeti,dimara/ganeti,ganeti/ganeti,ganeti-github-testing/ganeti-test-1,grnet/snf-ganeti,ganeti/ganeti,ganeti/ganeti