update platform version number for 0.5.1

Change-Id: I7d13d9395cd70b4de6fa7c6d5a9e5132d995ade1
update indentation to be standard

Change-Id: Ic0ac3a7e6c9ce0e5f95bab023dbbf890c31d9e1c
make sure concat fragments are put together before the openvpn service
is run, otherwise the openvpn service is restarted before config files
are deployed (#4154)

Change-Id: Ide38615714c1978bb90237986baea530c54153c3
change stunnel::service to 'subscribe' instead of 'require' the X509
cert/key. This has the same effect of 'require' because both make sure
that the mentioned resource(s) will be applied before this resource, but
subscribe will cause this resource to refresh anytime the subscribed
resources change (#4342)

Change-Id: I9470bb36f135b821b67a1da70c472d7687b08718