pgAdmin 4 commit: Remove some unnecessary imports from the pgadmin/__in

Remove some unnecessary imports from the pgadmin/__init__.py, and
removed the file hooks.py, which is not used any more with new
infrastructure.

Branch
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master

Details
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http://git.postgresql.org/gitweb?p=pgadmin4.git;a=commitdiff;h=39d432ca2cb68eea5b93eddff202c86f26e0748b

Modified Files
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web/pgadmin/__init__.py       |  4 ++--
web/pgadmin/settings/hooks.py | 16 ----------------
2 files changed, 2 insertions(+), 18 deletions(-)