SSL cipher and version

Last week, I ran across a situation where I needed to know the SSL
version and cipher in use for a particular database connection.
Magnus pointed me to contrib/sslinfo, but that didn't have quite what
I needed.  The attached patch adds two additional functions to
contrib/sslinfo to report this information.

Any objections to me committing this?

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise Postgres Company