tests: sort import lines in dumbhttp.py
This series is an attempt to enable import-checker.py for tests/**.py, but
it turned out not easy. Since many tests have been ported to absolute_import
without the coverage, import-checker.py reports a lot of errors right now.
Should we enable import-checker.py without fixing all of them so that we
won't get more errors?
running: init test1
result: None
running: add foo
result: 0
running: commit -m commit1 -d 2000-01-01 foo
result: None
running: commit -m commit2 -d 2000-01-02 foo
result: None
running: log -r 0
changeset: 0:0e4634943879
user: test
date: Sat Jan 01 00:00:00 2000 +0000
summary: commit1
result: None
running: log -r tip
changeset: 1:45589e459b2e
tag: tip
user: test
date: Sun Jan 02 00:00:00 2000 +0000
summary: commit2
result: None