tashi-client: rename example vm names from "foobar" to "vmname"
tashi-client: rename example host names from "fnord" to "vmhost1"
tashi-client: rename targetHostId arg in migrateVm to dst
tashi-client: allow migration destination to be a host name or host ID

git-svn-id: https://svn.apache.org/repos/asf/incubator/tashi/trunk@1352701 13f79535-47bb-0310-9956-ffa450edef68