ovs networking document

Update networking.md
Use codec to encode/decode api objects in client and kubecfg parser
Merge pull request #1115 from csrwng/use_codec_in_printing_and_parsing

Use codec to encode/decode api objects in client and kubecfg parser
avoid dumping error pages into error messages
Merge pull request #1215 from rajatchopra/ovsdoc

ovs networking document
Merge pull request #1232 from dbcode/master

avoid dumping error pages into error messages
Merge pull request #1231 from brendandburns/service

Fix a bug where we don't return an error.
Add an earlier check and error for names that won't work for services.