Merge remote-tracking branch 'origin/routing-manager'

Merge remote-tracking branch 'origin/routing-manager'

Implementation for Routing Manager.
1) Gateway resource Hosting and exchange of routing tables.
2) Linklist implemenation.
3) Routing table manager to add, remove, get next hop etc.
4) Routing message parser using cbor parser funtions.
5) Dynamic route updates on addition/removal of gateways.
6) Support for Endpoint

Please refer to below links for wiki and jira updates.
https://wiki.iotivity.org/routing_through_heterogeneous_transports
https://jira.iotivity.org/browse/IOT-565

Change-Id: I228b59ef922f55552386fb0b0e1b2bb2343b1adb
Signed-off-by: Abhishek Sharma <ce.abhishek@samsung.com>
Signed-off-by: koushik.girijala <g.koushik@samsung.com>
Signed-off-by: vimala.v <vimala.v@samsung.com>
Signed-off-by: Jaehong Jo <jaehong.jo@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/2301
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Ashok Babu Channa <ashok.channa@samsung.com>
Reviewed-by: Patrick Lankswert <patrick.lankswert@intel.com>