Set SYSFS_PORT_SPLIT_RE

[phhusson]

Test: Use path returned by adb devices -l (namely 1-13.3.3), and ensure
it has been parsed properly

[googlebot]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

📝 Please visit https://cla.developers.google.com/ to sign.

Once you've signed, please reply here (e.g. I signed it!) and we'll verify. Thanks.

---

• If you've already signed a CLA, it's possible we don't have your GitHub username or you're using a different email address. Check your existing CLA data and verify that your email is set on your git commits.
• If you signed the CLA as a corporation, please let us know the company's name.

[coveralls]

Coverage increased (+0.1%) to 47.692% when pulling 5359c17 on phhusson:fix-port-split into a9ea7b4 on google:master.

[coveralls]

Coverage increased (+0.1%) to 47.692% when pulling c1851a2 on phhusson:fix-port-split into a9ea7b4 on google:master.

[phhusson]

I've changed the git commit author address so that it matches a CLA I've already signed

[coveralls]

Coverage increased (+0.3%) to 47.84% when pulling fbeb7df on phhusson:fix-port-split into a9ea7b4 on google:master.

[fahhem]

Finally getting back to these older PRs... Why did you remove the _PortPathAction class? I honestly don't remember what that regex was supposed to be, so yours seems fine.

[phhusson]

Well, considering that PortPathMatcher splits and does the str to int conversion, it is a bit pointless to do it in the parameter parsing.

Another way to refactor this, is to change PortPathAction to take all the possible separators using the regexp, hence returning a list of ints, and delete the code from PortPathMatcher which splits strings.

[cclauss]

This is still an issue...

flake8 testing of https://github.com/google/python-adb on Python 3.6.3

$ flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics

./adb/adb_commands.py:295:36: F821 undefined name 'file'
        elif isinstance(dest_file, file):
                                   ^
./adb/common.py:207:48: F821 undefined name 'SYSFS_PORT_SPLIT_RE'
            port_path = [int(part) for part in SYSFS_PORT_SPLIT_RE.split(port_path)]
                                               ^
./adb/filesync_protocol.py:142:87: F821 undefined name 'file'
            total_bytes = os.fstat(datafile.fileno()).st_size if isinstance(datafile, file) else -1
                                                                                      ^
3       F821 undefined name 'file'
3