Update http_image config option to use latest image

`http_image config` option of `image` section is still referring
to old cirros image `cirros-0.3.1-x86_64-uec.tar.gz`.

Updated it to use new cirros image `cirros-0.6.2-x86_64-uec.tar.gz`.

Change-Id: I55e2fbd062c476e839fe8404bae18e918e745bc5
diff --git a/releasenotes/notes/image-config-http-image-default-value-change-476622e984e16ab5.yaml b/releasenotes/notes/image-config-http-image-default-value-change-476622e984e16ab5.yaml
new file mode 100644
index 0000000..96e9251
--- /dev/null
+++ b/releasenotes/notes/image-config-http-image-default-value-change-476622e984e16ab5.yaml
@@ -0,0 +1,7 @@
+---
+upgrade:
+  - |
+    Changed the default value of 'http_image' config option in the
+    'image' group to 'http://download.cirros-cloud.net/0.6.2/cirros-0.6.2-x86_64-uec.tar.gz'
+    from 'http://download.cirros-cloud.net/0.3.1/cirros-0.3.1-x86_64-uec.tar.gz' as former
+    image is very old and we should always use latest one.
\ No newline at end of file
diff --git a/tempest/config.py b/tempest/config.py
index a98082a..fc5dab8 100644
--- a/tempest/config.py
+++ b/tempest/config.py
@@ -638,8 +638,8 @@
                       "service, operator should set this parameter to True "
                       "if 'image_cache_dir' is set in glance-api.conf")),
     cfg.StrOpt('http_image',
-               default='http://download.cirros-cloud.net/0.3.1/'
-               'cirros-0.3.1-x86_64-uec.tar.gz',
+               default='http://download.cirros-cloud.net/0.6.2/'
+               'cirros-0.6.2-x86_64-uec.tar.gz',
                help='http accessible image'),
     cfg.StrOpt('http_qcow2_image',
                default='http://download.cirros-cloud.net/0.6.2/'