Hoxfix to support the base64 encoded credential.

Hoxfix to support the base64 encoded credential.

This patch for the test w/ CTT
to support base64 encoded private data as workround.
Also this changes will be replaced when I upload SVR data structure modification.

[Patch #1~#3] : Intial upload
[Patch #4] : Remove the compile errors for arduino

Change-Id: Iaddd6068e15e316cfc8cea1c7acda8e89f8fc9b0
Signed-off-by: Chul Lee <chuls.lee@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/8687
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Jongsung Lee <js126.lee@samsung.com>
Reviewed-by: Randeep Singh <randeep.s@samsung.com>