voxpupuligh-393: Rename variable to make it clear

We want the hostname string, not the host object.

lib/beaker/hypervisor/vagrant.rb

@@ -161,14 +161,14 @@ def cleanup
     end
 
     #snapshotting depends on https://github.com/scalefactory/vagrant-multiprovider-snap
-    def take_snapshot(host,snapshot_name)
-      @logger.debug "Creating snapshot of #{host}"
-      vagrant_cmd("snap take #{host} --name=#{snapshot_name}")
+    def take_snapshot(hostname,snapshot_name)
+      @logger.debug "Creating snapshot of #{hostname}"
+      vagrant_cmd("snap take #{hostname} --name=#{snapshot_name}")
     end
 
-    def restore_snapshot(host,snapshot_name)
-      @logger.debug "Restoring snapshot of #{host}"
-      vagrant_cmd("snap rollback #{host} --name=#{snapshot_name}")
+    def restore_snapshot(hostname,snapshot_name)
+      @logger.debug "Restoring snapshot of #{hostname}"
+      vagrant_cmd("snap rollback #{hostname} --name=#{snapshot_name}")
     end
 
     def vagrant_cmd(args)