Remove trailing '='s from unittests for networkstatus.parseRLine().
Remove trailing '='s from unittests for networkstatus.parseRLine().

Because of the bug fixed in the last commit, two unittests in
`test_parse_networkstatus.ParseNetworkStatusRLineTests` now FAIL. They
are:

  ø test_invalidDescriptorDigest_missingBase64padding
  ø test_invalidIPAddress

mmaker/bridgedb,pagea/bridgedb,pagea/bridgedb,wfn/bridgedb,wfn/bridgedb,mmaker/bridgedb