Include the QuoVadis root certificate in the Python and PHP client

code. The certificates on the Lookup server are about to be updated,
and the new certificates will be signed by this new root.

This update will be needed by many systems using Python and PHP,
since the default is for them not to include any root certificates.
Java clients won't be affected, since Java uses the system's default
root certificates.

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Imported using git-svn from
https://dev.csi.cam.ac.uk/svn/lookup/trunk@63