Add authorization options to Nebula 2.0 service (#303)

* replace graphd configs with Nebula 1.0 version and add enable_authorize and auth_type flag options when start Nebula service

restore options in Nebula 1.0

remain mutable options in gflags.json un changed

replace graphd configs with Nebula 1.0 version and add enable_authorize and auth_type flag options when start Nebula service

restore options in Nebula 1.0

remain mutable options in gflags.json un changed

replace graphd configs with Nebula 1.0 version and add enable_authorize and auth_type flag options when start Nebula service

restore options in Nebula 1.0

remain mutable options in gflags.json unchanged

* Fixed session timeout when FLAGS_session_idle_timeout_secs == 0

* reverted session_idle_timeout_secs back

* add comment

* Tests/add case for time index bound (#307)

* Remove timezone field.

* Fix the value to string.

* Remove extra blank.

* Add more.

* Correct the typo.

* Add test cases for index bound.

* Correct the error.

Co-authored-by: dutor <440396+dutor@users.noreply.github.com>

* Reuse the vid type check function. (#313)

Co-authored-by: dutor <440396+dutor@users.noreply.github.com>

* add comment

Co-authored-by: dutor <440396+dutor@users.noreply.github.com>
Co-authored-by: Shylock Hg <33566796+Shylock-Hg@users.noreply.github.com>