Disable 80chars/class_parameter_defaults checks

* Disable warnings for "line has more than 80 characters"
* Disable warnings for "parameterised class parameter without a default value"

We do not wish to track warnings for such violations.

Change-Id: I9884e2bd721d4f3e90e02a8a6fdc51219efcd819
corrected the postgresql link in .fixtures.yml

Change-Id: I0ca1df21ad25b2b5bf38317376ea58f33e641719