PCRpt message with vendor specific object throws exception

If ODL receives PCRpt message with vendor specific object, ODL throws exception and continue processing the next.

In AbstractMessageParser

if (VendorInformationUtil.isVendorInformationObject(objClass, objType)) {
Preconditions.checkState(this.viRegistry != null);

RFC Point:

“If the PCE does not understand an object with the P flag set or

understands the object but decides to ignore the object, the entire

PCEP message MUST be rejected and the PCE MUST send a PCErr message

with Error-Type="Unknown Object" or "Not supported Object" along with

the corresponding RP object. Note that if a PCReq includes multiple

requests, only requests for which an object with the P flag set is

unknown/unrecognized MUST be rejected.”

According to the above instead of throwing an exception, need to send the above error message to the peer.