Added additional frontend config for haproxy
Added additional frontend config for haproxy

This configuration will be added to all the front ends in the haproxy
job of the release paas-haproxy.

The configuration will capture the response headers [1] searching for the
header strict-transport-security, and then update the response
to add a default strict-transport-security if the proxied application
did not set one [2]

[1] https://cbonte.github.io/haproxy-dconv/configuration-1.5.html#4-capture%20response%20header
[2] https://cbonte.github.io/haproxy-dconv/configuration-1.5.html#4-http-response

alphagov/paas-cf,jimconner/paas-cf,alphagov/paas-cf,jimconner/paas-cf,jimconner/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,jimconner/paas-cf,alphagov/paas-cf,jimconner/paas-cf,jimconner/paas-cf,alphagov/paas-cf,jimconner/paas-cf