Resolve circular dependency for resource directory server

Resolve circular dependency for resource directory server

[Habib Virji]
RD Shared Library creates a circular dependency between
resource_directory and octbstack. This patch resolves this dependency by
creating a seprating findResource part of the resource_directory.

[Philippe Coval]
Backported to 1.2-branch
Without this change built on Tizen with RD_MODE=CLIENT,SERVER
 failed on missing oicresourcedirectory.c

Change-Id: I653b9130e10f22dd61f4f1bd0b6ff4c47a69606a
Signed-off-by: Habib Virji <habib.virji@samsung.com>
Origin: https://gerrit.iotivity.org/gerrit/13935
Signed-off-by: Philippe Coval <philippe.coval@osg.samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/14813
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Shuvradeb Barman Srijon <srijon.sb@samsung.com>
Reviewed-by: Ziran Sun <ziran.sun@samsung.com>