Move xtend dependency definition from md-sal pom to commons.opendaylight

Change-Id: Iece78be2da9a8797deb082a7d81030a2c85dac26
Signed-off-by: Tomas Olvecky <tolvecky@cisco.com>
Removed duplicated dependency declaration: ietf-netconf-monitoring,ietf-netconf-monitoring-extension from commons.opendaylight.

Change-Id: I1b834def2831acfae7749b24a6778f5811aca182
Signed-off-by: Tomas Olvecky <tolvecky@cisco.com>
Merge changes I1b834def,Iece78be2

* changes:
  Removed duplicated dependency declaration: ietf-netconf-monitoring,ietf-netconf-monitoring-extension from commons.opendaylight.
  Move xtend dependency definition from md-sal pom to commons.opendaylight