Initial setup of the octavia-tempest-plugin repo

This patch is the initial repository setup for octavia-tempest-plugin
using the OpenStack cookiecutter template.

Change-Id: Icce1389d3a9fb6076091d4d291e15773fb64544b
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..082213e
--- /dev/null
+++ b/requirements.txt
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+# The order of packages is significant, because pip processes them in the order
+# of appearance. Changing the order has an impact on the overall integration
+# process, which may cause wedges in the gate later.
+
+pbr!=2.1.0,>=2.0.0  # Apache-2.0