(PDB-962) Remove SSLv3 as a default from Jetty config

If the user doesn't specify `ssl-protocols` we should no longer default
to SSLv3 as it has known vulnerabilities. This commit changes the
default to be the TLS protocols. If the user has specified SSLv3, this
is allowed, but the user will be warned.
Updated docs to include --tlsv1 in all https curl examples
Merge pull request #1126 from senior/ticket/stable/pdb-962-sslv3-defaults

(PDB-962) Remove SSLv3 as a default from Jetty config