Delete NSStorageAdapter header file.

Delete NSStorageAdapter header file.

NSStorageAdapter.h file is used by both of provider and consumer.
For the above reason, when import both library, app will crash or build fail.
So in this patch,
NSStorageAdapter.h file is deleted, and related function was renamed.

Change-Id: Iaa243334e644014ea16eefd7338e90b112c0b633
Signed-off-by: KIM JungYong <jyong2.kim@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/12535
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Uze Choi <uzchoi@samsung.com>