Revert "kmswebrtcconnection: do not use nice_agent_attach_recv"
Revert "kmswebrtcconnection: do not use nice_agent_attach_recv"

This reverts commit 1cf32c588adb2f0d74e52b9e5051b9489819c867.

Change-Id: I9f8518cbdd1657f8366be6eca08c008c0a15b397

Kurento/kms-elements,Kurento/kms-elements,Kurento/kms-elements