type=user-id does not have an action parameter; remove commented action=set
Rewrite XML response message parser to use xml.etree.ElementTree
path/xpath to match each known format.  This will make it easier to
support additional messages formats.

Multi-line messages (multiple line elements) are now newline
delimited.
operation command 'show jobs id nn' can have response with path
'./result/job/details/line'; if so set status_detail to text (can
be multi-line).

example:

  $ panxapi.py -t pa-200 -Xo 'show jobs id "402"'
  op: success: Configuration committed successfully