Rebase remote-access over master

Rebase remote-access over master

Added the remote adapter code in connectivity/src/ra_adapter folder.
Adding plumbing throughout the stack for applications to do requests
over remote access.
Added a C sample app ocremoteaccessclient that makes all it's requests
ONLY through the RA adapter.

Change-Id: Ie1b250a0fad584e85631f66e3d2ec4f44607320d
Signed-off-by: Mandeep Shetty <mandeep.shetty@intel.com>
Signed-off-by: Sakthivel Samidurai <sakthivel.samidurai@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/1639
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Erich Keane <erich.keane@intel.com>