(QENG-762) add support to beaker scp_to/scp_from to ignore files of ...

... certain name/type

- added support to scp_to for an ignore list of files/dirs.  Does not
  support globbing.
Merge pull request #330 from anodelman/scp-ignore

(QENG-762) add support to beaker scp_to/scp_from to ignore files of ...
(QENG-922) Add `puppet_user` and `puppet_group` DSL methods.

Signed-off-by: Wayne <wayne@puppetlabs.com>
(QENG-992) `puppet.conf` must be usable by puppet user.

Signed-off-by: Wayne <wayne@puppetlabs.com>