PSK check before ciphersuite selection

PSK check before ciphersuite selection

Checking identity added to avoid including PSK suite
if no appropriate PSK in SVR DB.

Change-Id: I118c4b5864929cc8fdd0597af855f3c06b9332dc
Signed-off-by: Dmitriy Zhuravlev <d.zhuravlev@samsung.com>
Signed-off-by: Andrii Shtompel <a.shtompel@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/16731
Tested-by: jenkins-iotivity <jenkins@iotivity.org>
Reviewed-by: Oleksii Beketov <ol.beketov@samsung.com>
Reviewed-by: Randeep Singh <randeep.s@samsung.com>