Add Azure host

* add_host script to add new nodes, infranodes or hosts
    * Add vm, nic, disks, nsg, attach to lbs, etc.
    * Prepare host for OCP scale up
    * Run scale up
    * Auto name "discovery" (node0X+1)
    * Default sane values for everything except resourcegroup
    * Only jq required
NOTE: The current ansible modules doesn't support stuff like add host to
LB, availability set, specify the ipconfig name, etc., otherwise ansible
would have been used.
* Clean up ARM templates for unneeded variables
* Renamed infraavailabilityset to infranodeavailabilityset to be the
same as the others
* Clean up master.sh script for unneeded variables
* Removed yum update comment in node.sh
* Workaround for BZ: https://bugzilla.redhat.com/show_bug.cgi?id=1469358