Fix a flaky failure in socket_bind_test.

Fix a flaky failure in socket_bind_test.

Make the test more robust against the case where it use a IPv4 socket address
is already in use with IPv6 or vice versa by first finding a port that is free
for both.

BUG=
R=kustermann@google.com

Committed: https://github.com/dart-lang/sdk/commit/b1ce8afde50d723a5f359ce26019e1df510cc7d5

[Florian Schneider, 2016-05-26 16:49:32]

fschneider@google.com changed reviewers:
+ kustermann@google.com

[kustermann, 2016-05-26 16:56:27]

LGTM

https://codereview.chromium.org/2014893002/diff/1/tests/standalone/io/socket_...
File tests/standalone/io/socket_bind_test.dart (right):

https://codereview.chromium.org/2014893002/diff/1/tests/standalone/io/socket_...
tests/standalone/io/socket_bind_test.dart:116: var socket = await
ServerSocket.bind(InternetAddress.ANY_IP_V6, 0, v6Only: false);
long line

[Florian Schneider, 2016-05-26 17:38:38]

Description was changed from

==========
Fix a flaky failure in socket_bind_test.

Make the test more robust against the case where it use a IPv4 socket address
is already in use with IPv6 or vice versa by first finding a port that is free
for both.

BUG=
==========

to

==========
Fix a flaky failure in socket_bind_test.

Make the test more robust against the case where it use a IPv4 socket address
is already in use with IPv6 or vice versa by first finding a port that is free
for both.

BUG=
R=kustermann@google.com

Committed:
https://github.com/dart-lang/sdk/commit/b1ce8afde50d723a5f359ce26019e1df510cc7d5
==========

[Florian Schneider, 2016-05-26 17:38:40]

Committed patchset #1 (id:1) manually as
b1ce8afde50d723a5f359ce26019e1df510cc7d5 (presubmit successful).

[Florian Schneider, 2016-05-26 17:39:51]

On 2016/05/26 16:56:27, kustermann wrote:
> LGTM
> 
>
https://codereview.chromium.org/2014893002/diff/1/tests/standalone/io/socket_...
> File tests/standalone/io/socket_bind_test.dart (right):
> 
>
https://codereview.chromium.org/2014893002/diff/1/tests/standalone/io/socket_...
> tests/standalone/io/socket_bind_test.dart:116: var socket = await
> ServerSocket.bind(InternetAddress.ANY_IP_V6, 0, v6Only: false);
> long line

Will fix in a separate CL.