Support dynamic config of CoreDNS & Fix other bugs (#148)

* Support dynamic config of coredns & Fix other bugs

* Fix coredns flags in test

* Add dns domain in unittest

* Add more info in error message

Support multiple groups of shadow services (#147)

* Support multiple groups of shadow services

* Fix shadow unit tests

Fix flags of coredns installation (#146)

Bump v2.1.0 (#145)

Bump v2.0.0 (#138)

Bump v1.3.0 (#131)

Bump v1.2.0 (#79)

Update manual document for introducing native deployment support (#64)

* Update manual document for introducing native deployment support

* Apply suggestions from code review

Co-authored-by: Yun Long <[email protected]>

* Update as per comments

Co-authored-by: Yun Long <[email protected]>

Fix some problems of the emctl (#56)

* Fix some problems of the emctl

* Fix conflict