ovs-vsctl.at: Correct title of SSL test.

The test claimed to test peer-ca-cert functionality. But the
certificate provided via --peer-ca-cert was not actually sent
to the peer for bootstrapping. The bootstrapping was successful
because cert provided via --certificate was self-signed. Since the test
was not really testing the --peer-ca-cert functionality, change
the name of the test. We do not have any tests for bootstrapping,
so this test is still useful.

Signed-off-by: Gurucharan Shetty <gshetty@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>