dird: fix config reload and unit tests dependency issue

[alaaeddineelamri]

Description

When creating google tests that include ua_cmd, a dependency issue arises around the DoReloadConfig() function and forces developers to re-implement it within the test to return a random false. This PR fixes the issue.

Waiting on PR #1151 , and then need to be redone

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[pstorz]

Extrating the IsSameStorageDaemon() would be great.
Other than that: Good work!

[pstorz]

Good work. As soon as it successfully builds we can merge.

[pstorz]

Good work!