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Add Cred add symmetric key pair
Add Cred modification

TrustCA cert is saved in cred->publicdata
instead of optional data.
(see https://gerrit.iotivity.org/gerrit/#/c/21983/)

[IOT-2494] SVR DB Editor : Clean codes

Fix typo, memleak
Remove unnecessary codes.

New Feature: https://jira.iotivity.org/browse/IOT-2494Signed-off-by: Sangjoon Je <sangjoon.je@samsung.com>
Change-Id: I487786c432c7d51ead84d08fca0326d34b10e27a
Signed-off-by: Vadym Riznyk <v.riznyk@samsung.com>