medium: xmlutil: display ocf:heartbeat:RA as RA

Instead of displaying the fully qualified name,
just display the agent name for agents in the
ocf:heartbeat: namespace.
test: Test case for stripping ocf:heartbeat:
medium: parse: Clean up the CLI syntax display

* Don't show quotes when not necessary
* Allow a new syntax for $id nvpairs: Instead of

  node foo $id="1"

display as

  node 1: foo
low: main: Update --help output
doc: Update documentation with cleaned up CLI syntax