* adds netstate rpc server pagination, mocks pagination in test/util.go
* updates ns client example, combines ns client and server test to netstate_test, adds pagination to bolt client
* better organizes netstate test calls
* wip breaking netstate test into smaller tests
* wip modularizing netstate tests
* adds some test panics
* wip netstate test attempts
* testing bug in netstate TestDeleteAuth
* wip fixes global variable problem, still issues with list
* wip fixes get request params and args
* fixes bug in path when using MakePointers helper fn
* updates mockdb list func, adds test, changes Limit to int
* fixes merge conflicts
* fixes broken tests from merge
* remove unnecessary PointerEntry struct
* removes error when Get returns nil value from boltdb
* breaks boltdb client tests into smaller tests
* renames AssertNoErr test helper to HandleErr
* adds StartingKey and Limit parameters to redis list func, adds beginning of redis tests
* adds helper func for mockdb List function
* if no starting key provided for netstate List, the first value in storage will be used
* adds basic pagination for redis List function, adds tests
* adds list limit to call in overlay/server.go
* streamlines/fixes some nits from review
* removes use of obsolete EncryptedUnencryptedSize
* uses MockKeyValueStore instead of redis instance in redis client test
* changes test to expect nil returned for getting missing key
* remove error from `KeyValueStore#Get`
* fix bolt test
* Merge pull request #1 from bryanchriswhite/nat-pagination
remove error from `KeyValueStore#Get`
* adds Get returning error back to KeyValueStore interface and affected clients
* trying to appease travis: returns errors in Get calls in overlay/cache and cache_test
* handles redis get error when no key found
