Improve regression tests for uuid-ossp.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: c0f27628d2fb53e8e5d190da2132739a2bb2f500
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2014-05-28T18:21:17Z
Releases: 9.4.0
Improve regression tests for uuid-ossp.

On reflection, the timestamp-advances test might fail if we're unlucky
enough for the time_mid field to change between two calls, since uuid_cmp
is just bytewise comparison and the field ordering has more significant
fields later.  Build some field extraction functions so we can do a more
honest test of that.  Also check that the version and reserved fields
contain what they should.

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