Disable I18N in Nova's test suites

Messages translated into other language like Chinese cause some
unit tests to fail.

Fixes LP bug #1037946.

Change-Id: I01d04333d28bab52d6f424432524b206f3845fba

run_tests.sh

@@ -67,6 +67,10 @@ export NOSE_OPENSTACK_YELLOW=0.025
 export NOSE_OPENSTACK_SHOW_ELAPSED=1
 export NOSE_OPENSTACK_STDOUT=1
 
+export LANG=en_US.UTF-8
+export LANGUAGE=en_US:en
+export LC_ALL=C
+
 for arg in "$@"; do
   process_option $arg
 done

tox.ini

@@ -9,6 +9,10 @@ setenv = VIRTUAL_ENV={envdir}
          NOSE_OPENSTACK_YELLOW=0.025
          NOSE_OPENSTACK_SHOW_ELAPSED=1
          NOSE_OPENSTACK_STDOUT=1
+         LANG=en_US.UTF-8
+         LANGUAGE=en_US:en
+         LC_ALL=C
+
 deps = -r{toxinidir}/tools/pip-requires
        -r{toxinidir}/tools/test-requires
 commands = nosetests {posargs}