(PDB-964) Switch to using curl --tlsv1 everywhere

This works around the problems where sites are dropping SSLv3
support so our tests continue to work.

Signed-off-by: Ken Barber <ken@bob.sh>
Merge pull request #1125 from kbarber/ticket/stable/pdb-964-switch-curl-to-force-tlsv1

(PDB-964) Switch to using curl --tlsv1 everywhere