* Add more test cases for emqx_stats and emqx_os_mon
Fix test case error for emqx_ws_connection
* Add more test cases for emqx_sys_mon
* Update erlang otp to 22.1 for travis ci
* Delete readable=false for make ct
* Add unset_all_env for emqx_zone and update test cases
* Wrapper proper test cases into common test cases
* Improve test cases for reason code module (#2789)
* Split 3 proper tests into 3 ct cases
* Improve test cases for client, rpc and request-response
* Add psk suites to increase coverage
* Add sys test cases
* Pin cuttlefish rebar3 branch
* No shallow clone for rebar3
* Replace timer:sleep with receive after for deterministic
* Build with only rebar3
* bbmustache as a test dependency
* Change to plain deps
* Use shallow clone by default
* Add ct-helpers as test dep
This is done by moving coveralls send to after_success section
in .travis.yml.
having it in after_success should not make the build fail if
coveralls send fails due to server being overloaded etc.
* Rebar3 and erlang.mk dual support.
There was only erlang.mk support prior to this change.
The main reasons for this dual support are:
* Cover report upload can only be done by rebar3 in travis.ci
* We want to prepare for the future to build emqx releases using rebar3
* We do not want to stop supporting erlang.mk in one single step
* Add depencency version consistency check between erlang.mk and rebar.config