Update .coveragerc
Update .coveragerc

Set up proper source and omit options.

Change-Id: I13cc4bf4b3b349d1c868a4ff93ef33fd5ef292b8
Implements: blueprint update-coveragerc

yamt/networking-ofagent-old3,budnyjj/ofagent,yamt/networking-ofagent,budnyjj/ofagent