Mathoid configuration for beta labs

Based on cxserver configuration.

The mathoid role sets up a restd server that accepts
mathematical formulae as post requests and sends
back rendered math in MathML and SVG form.

This role has been tested locally at the
the labs instance mathoid-puppet.eqiad.wmflabs.

The deployment has not been tested. It has been assumed that
the mathoid files are located at
/srv/deployment/mathoid/mathoid.
On the test instance the role mathoid has been
configured via the puppet group mathoid in the
math cluster at the eqiad test cluster.

After the execution of the puppet script mathoid was tested
with a test rendering of the form

curl -d "q=E=mc^2" localhost:10042

The expected result is a json string with the last element
success:true.

See
RT: 6077
Change-Id: I77f412fc202c187fa37710c6e2c004c7ca94f6c6
Merge "Mathoid configuration for beta labs" into production