check_ssh: check protocol

It would be useful to be able to detect the protocols supported by the remote
ssh server to locate any using the insecure ssh v1 protocol. This patch
attempts to match against the protocol string in the ssh response.

Example:

check_ssh -H my.host.com -P 2.0
--
Just turning attached patch of github issue #780 into a push request.
(Closes #780)
check_tcp: also display the server addr when host_specified is set. This will help the admins when multiple checks are configured

Signed-off-by: Davide Madrisan <davide.madrisan@gmail.com>
Cleaned up status output of check_tcp changes
Merge pull request #1190 from waja/github780

check_ssh: check protocol
check_jabber.t - fixed tests for new status output including hostname
Merge PR #1265 from waja/check_tcp_server_addr