Fixed extraction of emulated devices name

Fixed extraction of emulated devices name

The adb_logcat_* scripts are extract attached devices names with
pattern 'w+', but it only works for real devices. Emulated devices
have names in form of 'emulator-5554' and '-' sign is not matched
by 'w+' parrent. This causes to logcat output to be missed while
tests are running

R=frankf@chromium.org, craigdh@chromium.org

TEST=Run tests with only emulators attached, ensure that resulting
log contains logcal output

Committed: https://crrev.com/044549b9d574c6fb633287a8ddb5f2df12be2b24
Cr-Commit-Position: refs/heads/master@{#300242}

[klundberg, 2014-10-17 14:28:56]

klundberg@chromium.org changed reviewers:
+ jbudorick@chromium.org, klundberg@chromium.org
- craigdh@chromium.org, frankf@chromium.org

[klundberg, 2014-10-17 14:28:56]

- craigdh, frankf as they have left Chrome
+ jbudorick

[jbudorick, 2014-10-17 17:36:15]

lgtm

Thanks for the patch!

[ripp, 2014-10-20 06:00:23]

The CQ bit was checked by ripp@yandex-team.ru

[commit-bot: I haz the power, 2014-10-20 06:00:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/661843003/1

[commit-bot: I haz the power, 2014-10-20 09:38:31]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-20 09:39:36]

Patchset 1 (id:??) landed as
https://crrev.com/044549b9d574c6fb633287a8ddb5f2df12be2b24
Cr-Commit-Position: refs/heads/master@{#300242}