[SCM-1026] Decrease git logging

**[Elliotte Rusty Harold](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=elharo)** opened **[SCM-1026](https://issues.apache.org/jira/browse/SCM-1026?redirect=false)** and commented

In GitCommandLineUtils a lot of logs like

if (LOGGER.isInfoEnabled()) {
LOGGER.info("Executing: " + commandline);
LOGGER.info("Working directory: " + commandline.getWorkingDirectory().getAbsolutePath());
}

should be demoted to debug. As long as it works, we don't want to read each step.

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No further details from [SCM-1026](https://issues.apache.org/jira/browse/SCM-1026?redirect=false)

Inspect GitCommandLineUtils and its existing logging calls, starting with the execution and working-directory messages shown in the issue. Demote the routine messages from info to debug, then run the relevant project tests or test suite and confirm normal Git operations no longer produce these messages at info level.

Written by the indexing model from the issue text.