[r=klyachin] maas: improved tests with new gomaasapi
Improved provider/maas testing using new gomaasapi test server features.
1, New tests:
- TestGetNetworkMACs - getNetworkMACs function should read connected MACs to the
network
- TestGetInstanceNetworkInterfaces - getInstanceNetworkInterfaces should read
list of network interfaces together with their MACs using data from
commissioning stage
- TestSetupNetworks - setupNetworks function should get []NetworkInfo data
combining the data from getNetworkMacs and getInstanceNetworkInterfaces
functions
- TestSupportNetworks - verify that gomaasapi supports network operations
2. gomaasapi was advanced to new revision in dependencies.tsv
https://codereview.appspot.com/88380044/
R=dimitern
R=dimitern