hbal: also extend reason trail
hbal: also extend reason trail

If hbal submits jobs, also add an entry to the
reason trail, showing when hbal started submitting
the jobs.

Signed-off-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>
Reviewed-by: Hrvoje Ribicic <be5828fca31f89218048bec4189e30a581aa65da@google.com>
Reviewed-by: Petr Pudlak <9d19625f8ee825a2c398462ed335cbcf98f79c32@google.com>

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