Fix netconf ssh client

Do not throw exceptions from Runnable, instead log them.

Change-Id: I0e5e6cb2b23eacecc5e4b4a737437d3c4e5058b3
Signed-off-by: Tomas Olvecky <tolvecky@cisco.com>
BUG 484 - XmlReader improve readability

- XmlReader - improve readibility of methods isSimple(Composite) node by
  extracting common logic to method skipCommentsAndWhitespace.

The change comes from patch set
https://git.opendaylight.org/gerrit/#/c/7337/9
which was originally commited by Tom Pantelis. In this commit is selected
only one change which doesn't relate with BUG 484

Change-Id: Icef852da20e8f624b4bc3d61e334d88f4766474d
Signed-off-by: Jozef Gloncak <jgloncak@cisco.com>
Merge "Fix netconf ssh client"
Merge "BUG 484 - XmlReader improve readability"