remove remote services, the code is not necessary to use this project…

… as a nebula driver (#200)

* remove remote services, the code is not necessary to use this project as a nebula driver

* Create integration tests (#201)

* add build tag for integration tests

* add unit rule to run unit tests

* add unit as phony

* improve formatting of each _test file, enable coverate on functional tests

* add badge for test results

Co-authored-by: Yichen Wang <[email protected]>