Remove OJDBC and resin artifacts from ci-dependencies driectory as they as not Apache license compatible.
The user can onetime manually download them, and the maven reactor will automatically build the corresponding plugins.

OJDBC is OTN which requires a user click-through agreement.
Resin is GPLv3, meaning any derivative work must also be GPLv3 licensed.
https://www.apache.org/licenses/GPL-compatibility.html

ref: https://github.com/apache/incubator-skywalking/pull/737

Move `apm-network` module under the new root module `apm-protocol`. And add `apm-ui-query` under the `apm-protocol` module.

Do not use the propertie for checkstyle header file path that lead to the checkstyle plugin of IntelliJ idea not work.

* Update architecture graph.
* Update REAMDME.

This reverts commit 5c56d41a.

So change coverage tools from Cobertura to JaCoCo

Fix an out-of-date package name.

Exclude the grpc generated codes for ci coverage.