Retry the integration setup on connection error

Sometimes there are network errors communicating with pypi
during a long running (1h+) integration gate job. This
causes the job to fail, and wastes a lot of time re-running
the job to get it to pass. This change makes it less likely
to fail, as if there is a timeout or socket error, the
integration setup will retry.

Change-Id: Ic4c888626699eb710e85e3bdc48dd6ee74bdf024

tools/integration.sh

@@ -55,9 +55,25 @@ EOF
 cat <<EOF > setup.py
 import setuptools
 
-setuptools.setup(
-    setup_requires=['pbr'],
-    pbr=True)
+try:
+    from requests import Timeout
+except ImportError:
+    from pip._vendor.requests import Timeout
+
+from socket import error as SocketError
+
+# Some environments have network issues that drop connections to pypi
+# when running integration tests, so we retry here so that hour-long
+# test runs are less likely to fail randomly.
+try:
+    setuptools.setup(
+        setup_requires=['pbr'],
+        pbr=True)
+except (SocketError, Timeout):
+    setuptools.setup(
+        setup_requires=['pbr'],
+        pbr=True)
+
 EOF
 
 mkdir test_project