Fix linux_me2me_host.py to handle relative path to self.

Fix linux_me2me_host.py to handle relative path to self.

After crrev.com/310952 linux_me2me_host.py fails to start if it's called
using relative path. This CL fixes it. The problem was that it was trying
to run itself using sys.argv[0] after changing current directory, and
this works only if argv[0] is an absolute path.

Committed: https://crrev.com/706050db180f4f8012e4026d4dfd15565beab902
Cr-Commit-Position: refs/heads/master@{#313565}

[Sergey Ulanov, 2015-01-28 18:33:57]

sergeyu@chromium.org changed reviewers:
+ lambroslambrou@chromium.org

[Lambros, 2015-01-28 18:59:23]

lgtm

[Sergey Ulanov, 2015-01-28 19:01:23]

The CQ bit was checked by sergeyu@chromium.org

[commit-bot: I haz the power, 2015-01-28 19:01:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/883063002/1

[commit-bot: I haz the power, 2015-01-28 19:49:28]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-28 19:50:21]

Patchset 1 (id:??) landed as
https://crrev.com/706050db180f4f8012e4026d4dfd15565beab902
Cr-Commit-Position: refs/heads/master@{#313565}