Fixes the host service crash during fast-reboot

[Kalimuthu-Velappan]

Change-Id: I634f60453dfc70f755381fdf0aec56457e1b45c7

- What I did
Fixes the host service crash during fast-reboot:

Fast reboot command restarts the system by killing the services quickly instead of doing a graceful shutdown. As part of that, it stops the docker service before stopping the host services that cause database connection reset errors.

     Aug 13 06:00:43.877495 Leaf1 INFO caclmgrd[2403]: self.config_db.listen()
     Aug 13 06:00:43.877520 Leaf1 INFO caclmgrd[2403]: File "/usr/local/lib/python2.7/dist-ackages/swsssdk/configdb.py", line 94, in listen

     Aug 13 06:00:43.877651 Leaf1 INFO hostcfgd[2463]: for item in self.pubsub.listen():
     Aug 13 06:00:43.877671 Leaf1 INFO hostcfgd[2463]: File "/usr/local/lib/python2.7/dist-packages/redis/client.py", line 2501, in listen
     Aug 13 06:00:43.879178 Leaf1 INFO hostcfgd[2463]: raise ConnectionError(self._error_message(e))
     Aug 13 06:00:43.879197 Leaf1 INFO hostcfgd[2463]: redis.exceptions.ConnectionError: Error 111 connecting to 127.0.0.1:6379. Connection refused.
     Aug 13 06:00:43.879253 Leaf1 INFO caclmgrd[2403]: raise ConnectionError(self._error_message(e))
     Aug 13 06:00:43.879272 Leaf1 INFO caclmgrd[2403]: redis.exceptions.ConnectionError: Error 111 connecting to 127.0.0.1:6379. Connection refused.

- How I did it
Stop the following host services before stopping the docker service.

  root# systemctl stop hostcfgd.service caclmgrd.service

- How to verify it
Run the fast-reboot command multiple times.

- Previous command output (if the output of a command-line utility has changed)

- New command output (if the output of a command-line utility has changed)

-->

[Kalimuthu-Velappan]

Updated the systemctl service

[yxieca]

@Kalimuthu-Velappan Just want to confirm, the issue is only error messages in the syslog, there is not fast reboot failure without this change, right?

[Kalimuthu-Velappan]

Yes, the issue is only error messages in the Syslog, there is no fast reboot failure without this change

[yxieca]

retest this please

[yxieca]

retest this please

[jleveque]

Retest this please