Fix pylint warnings

Fix pylint warnings

** Presubmit Warnings **
Pylint (435 files) (35.97s) failed
************* Module telemetry.page.page_test_unittest
W: 17, 0: Unused import scalar (unused-import)
************* Module telemetry.unittest_util.run_tests_unittest
C: 44, 0: Exactly one space required before assignment
    host  = runner.host
          ^ (bad-whitespace)

BUG=

Committed: https://crrev.com/198f170a152a2755a238ac6e97ecf2a6d0cbec52
Cr-Commit-Position: refs/heads/master@{#305070}

[Yufeng Shen (Slow to review), 2014-11-20 19:06:27]

miletus@chromium.org changed reviewers:
+ nednguyen@google.com

[tonyg, 2014-11-20 19:10:36]

tonyg@chromium.org changed reviewers:
+ tonyg@chromium.org

[tonyg, 2014-11-20 19:10:36]

The CQ bit was checked by tonyg@chromium.org

[tonyg, 2014-11-20 19:10:36]

lgtm

[commit-bot: I haz the power, 2014-11-20 19:11:29]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/744533004/1

[commit-bot: I haz the power, 2014-11-20 20:15:48]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-11-20 20:16:33]

Patchset 1 (id:??) landed as
https://crrev.com/198f170a152a2755a238ac6e97ecf2a6d0cbec52
Cr-Commit-Position: refs/heads/master@{#305070}