[ISSUE #456] Remove license name, add LICENSE file

[ruanwenjun]

related issue #456

1. remove license name in allowed-licenses.txt
2. use LICENSE to announce the license

[codecov-commenter]

Codecov Report

Merging #535 (b7d5282) into develop (8b6c827) will decrease coverage by 0.07%.
The diff coverage is 0.00%.

@@              Coverage Diff              @@
##             develop     #535      +/-   ##
=============================================
- Coverage      11.20%   11.13%   -0.08%     
+ Complexity       389      385       -4     
=============================================
  Files            261      261              
  Lines          12296    12296              
  Branches        1044     1044              
=============================================
- Hits            1378     1369       -9     
- Misses         10800    10810      +10     
+ Partials         118      117       -1     

Impacted Files	Coverage Δ
...ol/tcp/client/group/ClientSessionGroupMapping.java	0.00% <0.00%> (ø)
...tandalone/broker/task/HistoryMessageClearTask.java	33.33% <0.00%> (-16.67%)	⬇️
...mesh/connector/standalone/broker/MessageQueue.java	32.46% <0.00%> (-7.80%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 8b6c827...b7d5282. Read the comment docs.

[jonyangx]

========================================================================
LGPL licenses

The following components are provided under the LGPL License. See project link for details.
The text of each license is also included at licenses/LICENSE-[project].txt.

hibernate-commons-annotations 5.1.2.Final: https://mvnrepository.com/artifact/org.hibernate.common/hibernate-commons-annotations/5.1.2.Final, LGPL 2.1
hibernate-core 5.4.32.Final: https://mvnrepository.com/artifact/org.hibernate/hibernate-core/5.4.32.Final, LGPL 2.1

refer to: https://www.apache.org/legal/resolved.html
LICENSE file must not include LGPL2.1 license .

[ruanwenjun]

@jonyangx Thanks for your reminder, this is a big mistake. I have removed these licenses, since these are not in binary jar. And now the LICENSE only contains binary dependency.

[ruanwenjun]

@xwm1992 I think we may still need to use a shell script to check the license, rather than use gradle license check plugin. Because the gradle plugin check result doesn't correct, some of them are not appeared in the binary file.

[ruanwenjun]

This pr is ready to review now.

[xwm1992]

LGTM