tests/integrated: Basic repo insert, delete and read test case

Integrated tests are separated from unit tests:

* ./build/unit-tests
* ./build/integrated-tests

Change-Id: I766478de6ec4b7925d4d0dd5ec44e7e667de891b
diff --git a/tests/integrated/README.md b/tests/integrated/README.md
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+Running integrated tests
+========================
+
+In order to run integrated tests, NFD (nfd and nrd) should be running.
+
+Suggested command sequence:
+
+    nfd-start
+    ./build/integrated-tests
+    nfd-stop