Increased OS_TEST_TIMEOUT in .testr.conf to 700

Setting OS_TEST_TIMEOUT as ENV var.

Default OS_TEST_TIMEOUT is 500s, but for the test
test_user_update_own_password this is not enough
because by default in MCP the user_lockout_duration
is 600s, so the test is sleepning for 600s and not
finished, but it is stopped by testr. Increasing
of OS_TEST_TIMEOUT to more than user_lockout_duration
helps the test to pass.

Related-prod: PROD-30989
Related-prod: PROD-30992

Change-Id: I7179ababeacf4582c5966ffdce596369b8bb5c11
diff --git a/Dockerfile b/Dockerfile
index 07d3671..c7d6e7d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,7 +5,8 @@
     DEBCONF_NONINTERACTIVE_SEEN=true \
     LANG=C.UTF-8 \
     LANGUAGE=$LANG \
-    LOG_DIR='/root/tempest'
+    LOG_DIR='/root/tempest' \
+    OS_TEST_TIMEOUT=700
 SHELL ["/bin/bash", "-o", "pipefail", "-xec"]
 USER root
 ADD data /var/lib/