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This changes includes some refactoring of credential resource design:
 each credential structure instance has own rowner id value
 and it was changed to common rowner value.

IOT-2641 depends on it.

Tested with CT1.7.9.3 and 1.7.9.1, 1.7.4.1

json2cbor and svrdbeditor sources should be fixed accordingly by their owners

Change-Id: I50afae10ac9f702c86d321dcf758525968f7bc31
Signed-off-by: Aleksey Volkov <a.volkov@samsung.com>