Removed unnecessary/duplicated code in connectivity abstraction

Removed unnecessary/duplicated code in connectivity abstraction

remove unnecessary/duplicated code in connectivity abstraction
to increase unit tc coverage

Change-Id: Ifa589642b43f1590ed492a129a0af4a2cd954358
Signed-off-by: hyuna0213.jo <hyuna0213.jo@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/5607
Reviewed-by: jihwan seo <jihwan.seo@samsung.com>
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Jon A. Cruz <jon@joncruz.org>
Reviewed-on: https://gerrit.iotivity.org/gerrit/5729
Reviewed-by: Jaehong Jo <jaehong.jo@samsung.com>