Refactor of the logics of Multi-configuration Isolation

[xingfudeshi]

Ⅰ. Describe what this PR did

For the current logics of loading different configuration,it's a bit complicated to understand.So,i'm gonna improve it,and make it clearly.So,the new logics will be like:
At first,will try to read the name from JVM parameters(when use -Dxxx=xx),if reads nothing,will try to read the name from system environment,if reads nothing again,then will ues default configuration:file.conf,registry.conf.
For example,if we have a testing environment called "test",then these conf files should be in the following format:
file-test.conf registry-test.conf

Ⅱ. Does this pull request fix one issue?

fixes #1532

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

I've done integration testing.

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov-io]

Codecov Report

Merging #1533 into develop will decrease coverage by 0.02%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop    #1533      +/-   ##
=============================================
- Coverage      46.44%   46.41%   -0.03%     
  Complexity      1692     1692              
=============================================
  Files            347      347              
  Lines          12719    12719              
  Branches        1591     1591              
=============================================
- Hits            5907     5904       -3     
- Misses          6171     6173       +2     
- Partials         641      642       +1

Impacted Files	Coverage Δ	Complexity Δ
...server/store/file/FileTransactionStoreManager.java	45.99% <0%> (-1.05%)	19% <0%> (ø)

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[slievrly]

LGTM

[zjinlei]

LGTM