Define two consts Pod and Svc, makes it stand out a little more
when used in switches in case.
We have opted for a new type, but then you need to convert them
all the time with string(Foo).
Drop the interfaceAddr interfaces and just use a function. Cleanup
all fallout from that. Remove the use of global variables and cleanup
the tests a bit.
* cleanup: go vet and golint run
Various cleanups trickered by go vet and golint.
* Fix tests and lowercase all errors
Lowercase all errors, some tests in kubernetes use errors from
kubernetes which do start with a capital letter.
