Log security_type to SR
Log security_type to SR

Summary:
I'd like to log what type of handshake was performed to servicerouter. Right now it will just log 0,1,2 where
0 = sasl
1 = gss
2 = gss_no_mutual

I guess I can map these to string, but not sure if it's worth it. We don't do this for other things in the SR logs.

Test Plan: Tried different handshake types, looked at the logs.

Reviewed By: mshneer@fb.com

Subscribers: ngbronson, mcduff, hitesh, alandau, bmatheny, mshneer, yfeldblum, acampi, shamdor, wstefancik

FB internal diff: D1983094

Signature: t1:1983094:1429134325:1e41dcd717f9a51aaa7ebfc812e7b4fdc10ab29a

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