provisioning: Rename some C++ headers to avoid collision with CSDK ones

provisioning: Rename some C++ headers to avoid collision with CSDK ones

The name clash only happens
 on case insensitive filesystems (ie HPFS on MacOS),
 there is ambiguity with C header ie:
  ./resource/csdk/security/provisioning/include/ocprovisioningmanager.h
  ./resource/include/OCProvisioningManager.h

Renaming to .hpp suffix prevent the problem.

Note, one other approach would be to use namespaces

Like:
   #include <iotivity/csdk/ocprovisioningmanager.h> vs
   #include <iotivity/oc/ocprovisioningmanager.h> or similar

Change-Id: Ie311344a98fd056e5b54f329819090a36a901589
Signed-off-by: Philippe Coval <philippe.coval@osg.samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/14747
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Habib Virji <habib.virji@samsung.com>