CustomUserDetailsService: remove unused import.

Correction for ca37dbd8e916a9cfda6032a78e6246c949a17a6b commit.

Reported by CheckStyle.

No functional changes.
UserService: remove unused import.

Correction for 76f5449418b5b68be1da31b3164258b914612a05 commit.

Reported by CheckStyle.

No functional changes.
Rephrase some of log messages.

No functional changes.
Run WhenAnonymousUserAddSeries test case.

Should be in d54525d2e06ad05b960b6a267a724146d6af74bb commit.

No functional changes.
Run WhenAdminAddSeries test case.

Should be in ca37dbd8e916a9cfda6032a78e6246c949a17a6b commit.

No functional changes.