Upgrade to pylint >=1.3.0

The .pylintrc used for neutron refers to checks added in pylint 1.3.0,
and aborts on earlier versions (from a quick experiment).

This change moves global requirements to pylint>=1.3.0.

Change-Id: I2795214f90c2338ef968210432565a978c1d636b
Merge "Upgrade to pylint >=1.3.0"