feature:support new parameter option "-e" used for setting name of configuration.

[xingfudeshi]

Ⅰ. Describe what this PR did

As described in issue #1683,So i added a new parameter option "-e" to fix it.
And this is only available on the server side,for the client side,you can still use JVM parameter to set
the name of multi-configuration isolation directly.

Usage: sh seata-server.sh(for linux and mac) or cmd seata-server.bat(for 
      windows) [options]
  Options:
    --host, -h
      The ip to register to registry center.
    --port, -p
      The port to listen.
      Default: 8091
    --storeMode, -m
      log store mode : file、db
    --serverNode, -n
      server node id, such as 1, 2, 3. default is 1
      Default: 1
    --seataEnv, -e
      The name used for multi-configuration isolation.
    --help

Ⅱ. Does this pull request fix one issue?

fixes #1683

Ⅲ. Why don't you add test cases (unit test/integration test)?

UT provided,i've tested it.

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

After this PR merged,i will update wiki as well.

[codecov-io]

Codecov Report

Merging #1689 into develop will increase coverage by <.01%.
The diff coverage is 71.42%.

@@             Coverage Diff              @@
##             develop   #1689      +/-   ##
============================================
+ Coverage      46.99%     47%   +<.01%     
- Complexity      1785    1787       +2     
============================================
  Files            365     365              
  Lines          13299   13301       +2     
  Branches        1642    1644       +2     
============================================
+ Hits            6250    6252       +2     
  Misses          6371    6371              
  Partials         678     678

Impacted Files	Coverage Δ	Complexity Δ
...eata/core/rpc/netty/AbstractRpcRemotingServer.java	0% <0%> (ø)	0 <0> (ø)	⬇️
server/src/main/java/io/seata/server/Server.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...src/main/java/io/seata/server/ParameterParser.java	56.66% <100%> (+3.09%)	8 <1> (+2)	⬆️

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[l81893521]

Test passed. LGTM

[slievrly]

LGTM