r/vmhost: mount shared filesystems

With the transition away from *dhcpcd* on the VM hosts, there is no
longer any need for a custom wait script that must run prior to
attempting to mount the shared filesystem.  This dramatically simplifies
the configuration necessary for shared storage.

I don't really see any reason why the shared storage configuration needs
to be managed by a separate role.  The *vmhost* role is not really
generic anyway, and will probably not work for any other VM host
deployment besides the two machines running now.  As such, I think it
makes sense to move the task to mount the shared filesystem into the
*vmhost* role and drop the *dch-storage-net* role.

vmhost.yml

@@ -11,4 +11,3 @@
 - hosts: vm-hosts
   roles:
   - vmhost
-  - dch-storage-net