Improve RAPI detection of the watcher
Improve RAPI detection of the watcher

If the watcher is not allowed to access RAPI, it doesn't mean that it is dead
and needs to be restarted.

Fixes Issue 752.

Signed-off-by: Michele Tartara <05f7077a2c6cbbdc4af4ba42e3ef89a0df846179@google.com>
Reviewed-by: Hrvoje Ribicic <be5828fca31f89218048bec4189e30a581aa65da@google.com>

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