Multiple environmental isolation

[XCXCXCXCX]

Switch environments by specifying env environment variables, let seata use different environment configurations.

example:
past
+file.conf
+registry.conf

now
+file-dev.conf
+registry-dev.conf
+file.conf
+registry.conf

Use -Denv=dev to recognize the suffix, and choose registry-dev.conf configuration.
when -Denv=default or null, use registry.conf.
when -Denv=unknown, use NULL configuration, at this point some objects will report an error due to missing configuration.

[codecov-io]

Codecov Report

Merging #1075 into develop will decrease coverage by 0.01%.
The diff coverage is 75%.

@@              Coverage Diff              @@
##             develop    #1075      +/-   ##
=============================================
- Coverage      41.87%   41.85%   -0.02%     
  Complexity      1361     1361              
=============================================
  Files            243      243              
  Lines          10118    10118              
  Branches        1325     1325              
=============================================
- Hits            4237     4235       -2     
  Misses          5333     5333              
- Partials         548      550       +2

Impacted Files	Coverage Δ	Complexity Δ
...a/io/seata/discovery/registry/RegistryFactory.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...ery/registry/consul/ConsulRegistryServiceImpl.java	4.76% <100%> (ø)	1 <1> (ø)	⬇️
...very/registry/zk/ZookeeperRegisterServiceImpl.java	63.77% <100%> (ø)	24 <0> (ø)	⬇️
...covery/registery/etcd/EtcdRegistryServiceImpl.java	14.4% <100%> (ø)	3 <0> (ø)	⬇️
...server/store/file/FileTransactionStoreManager.java	45.64% <0%> (-0.7%)	19% <0%> (ø)

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[xingfudeshi]

Good!

[leizhiyuan]

maybe you can provide a util class to set or resolve the env value
default it can fetch from system properties
when users use spring ，maybe they want to config from the application.properties ，so they can invoke your util method instead of use System.setProperty or pass by -D

[xingfudeshi]

@leizhiyuan To read configs from application,it's better to create a module separately to do that.like seata-spring-boot-starter.

[leizhiyuan]

LGTM

[xingfudeshi]

LGTM

[xingfudeshi]

There are conflict files.

[xingfudeshi]

This kind of configuration isolation is acceptable on the server side, but may not be so good on the client side, such as spring-boot.

[xingfudeshi]

I think an environment variable can be added. The name is SEATA_CONFIG_ENV. Before loading the configuration file, both the server and the client should read the environment variable of the current System (using system.getenv).If it's not blank then load the corresponding configuration files, such as registry-dev.conf and file-dev.conf, where dev is the value read from the environment variable.

[XCXCXCXCX]

I think an environment variable can be added. The name is SEATA_CONFIG_ENV. Before loading the configuration file, both the server and the client should read the environment variable of the current System (using system.getenv).If it's not blank then load the corresponding configuration files, such as registry-dev.conf and file-dev.conf, where dev is the value read from the environment variable.

Good idea.

[xingfudeshi]

it's better to define a constant for "default".

[xingfudeshi]

Thanks.LGTM.

[funky-eyes]

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