write openchange options to use mysql as backend on smb.conf
provision openchangedb with mysql as backend
change permissions of smb.conf to 600
write openchange mysql config on smb.conf only if provisioned with mysql backends
add arg to smb.conf.mas
Merge branch 'master' into jgarcia/openchange-with-mysql

Conflicts:
	main/openchange/ChangeLog
	main/openchange/src/EBox/OpenChange/Model/Provision.pm
	main/samba/ChangeLog
Merge pull request #985 from Zentyal/jgarcia/openchange-with-mysql

openchange with mysql