Fix teragrep exec syslog stream command not working with subsequent commands when using host and port parameters #67
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Fixes #66.
Basically the issue was that the port number was recognizable only in the grammar mode "COMMAND_TERAGREP_MODE_IP", but when the parser read it, it didn't pop the grammar mode back to the mode where it can recognize other tokens again (like the pipe token).
Created unit tests for the command and refactored the whole unit test file to not throw exceptions in tests because that is not good practice.