make 'fips update' check for existing git repository #227
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Aligns 'fips update' with the change to 'fips diag imports' in #196 .
Right now, if a dependency isn't a "real" Git repository, 'fips update' just tries to run submodule updates on the parent repository instead, if there are any.
I also removed that one comment line which didn't fit, probably a copy&paste leftover from
_rec_fetch_imports()
.