Add proper ping/status checks before volume creation.

This adds proper (optional) ping checks with fping and gluster peer
status checks to ensure the peer are available before a volume create
command. This required rewriting of the xml.py hack which helps puppet
interface with the xml formatted gluster cli output. In addition,
downstream commands such as volume::property gained checks to ensure the
volume was present beforehand. While it is not obvious, it should be
noted that because of the distributed nature of glusterfs, more than one
puppet run will be required for complete deployment. With these patches,
individual runs shouldn't ever end in temporary error as they used too.

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