(QENG-845) Beaker junit xml: XML Parsing error

- need to strip out invalid characters from strings before printing to
  xml, these characters are still invalid even if wrapped in a cdata
  tag
Merge pull request #371 from anodelman/xml

(QENG-845) Beaker junit xml: XML Parsing error
(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-1012) (gh-143) beaker scp moving data one byte at a time

- force chunk_size during transfer
- print more debug metrics so that we can monitor how quickly files are
  moved