Merge juju-bmc:StrictHostKeyChecking_no into juju-bmc:master

[Joe Guo]

juju-bmc: set StrictHostKeyChecking to no

when ssh to new host, ssh will ask question.
However, while using sshpass to call ssh, the question will now show up,
and command will exit without message.

set StrictHostKeyChecking=no to avoid such issue.

[Jose Guedez (jfguedez)]

LGTM

review: Approve

diff --git a/src/juju-bmc b/src/juju-bmc
index da36acd..acd6c7d 100755
--- a/src/juju-bmc
+++ b/src/juju-bmc
@@ -155,6 +155,7 @@ def main():
                 'sshpass', '-p', power_pass,
                 'ssh', '{}@{}'.format(power_user, power_address),
                 '-o', 'PubkeyAuthentication=no',
+                '-o', 'StrictHostKeyChecking=no',
             ] + command
         else:
             LOG.info('connecting to BMC via ipmi')