Disable Network integration tests (#21273)

This will disable the integration tests for all network platforms &
modules, though the unit tests will still run.

This is needed while a large refactor of the networking code is done.

shippable.yml

@@ -20,8 +20,6 @@ matrix:
     - env: TEST=windows/2
     - env: TEST=windows/3
 
-    - env: TEST=network
-
     - env: TEST=linux/centos6/1
     - env: TEST=linux/centos7/1
     - env: TEST=linux/fedora24/1