Fix for Support for behind web proxy #39

[ibre5041]

This RP addresses these issues:

• Support for behind web proxy Support for behind web proxy #39, The core of application already works fine behind proxy, but accessing rete-limit API does not respect JVM proxy setting

• Log4j version was upgraded to 2.17.2

• Source and Target version was upgraded to Java 1.8

• Last patch is workaround for faulty RateLimitManager.getApiLimitForDomain(...) returns 0 for threadCount and then following line:

    pool = Executors.newFixedThreadPool(threadCount);
  

throws IllegalArgumentException.

[vojtechDB]

proxy setting could be used if this PR would be merged in this way:

java -Dhttp.nonProxyHosts="github.mycompany.com" -Dhttps.proxyHost=192.168.100.1 -Dhttps.proxyPort=8080 -jar OpsGenieExportUtil-0.xx.xx.jar .......

[sampath-kolisetty]

@ibre5041 @vojtechDB Please update your branch with latest master and resolve conflicts.

[vojtechDB]

@sampath-kolisetty new PR with solved conflict created #55

[idi2022]

Hello, @sampath-kolisetty @@ibre5041 @vojtechDB
and thanks for all the edits
can we know when we will have the new version because we are blocked by the proxy from ni internal gitlab
thank you