Add csit test plans for policy-api

Includes:
1) Added setup, teardown scripts and test plan
2) Added test robot including test cases

Issue-ID: POLICY-1270
Change-Id: Id4fe5527609d9e13906d02bccc4ae8bc7c364bd9
Signed-off-by: Chenfei Gao <cgao@research.att.com>
diff --git a/plans/policy/api/testplan.txt b/plans/policy/api/testplan.txt
new file mode 100644
index 0000000..1bfec14
--- /dev/null
+++ b/plans/policy/api/testplan.txt
@@ -0,0 +1,3 @@
+# Test suites are relative paths under [integration/csit.git]/tests/.
+# Place the suites in run order.
+policy/api/api-test.robot