Add os-net-config dependency

I5f51ecb5c64fc9c13eabc16b2b43b5dda1b38d65 in tripleo-image-elements
added a dependency on the os-net-config element which installs
the os-net-config package but global requirements is missing
this package.

Change-Id: I62e19ec92fbcfa3c029aeecdeed08c1e58f19d7f
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
bump pecan minimum version number to 0.8.0

Several bugs have been fixed in more recent releases of pecan[1].  The
JSON handling in 0.8.0 will make it easier to transition to pecan.

[1] http://pecan.readthedocs.org/en/latest/changes.html

Change-Id: I773b52e2a0dcbf7e17dc9653b069ff0ee989e040
Merge "Add os-net-config dependency"
Merge "Upgrade to pylint >=1.3.0"
Merge "bump pecan minimum version number to 0.8.0"