[VOL-2235] Mocks and interfaces for rw-core

This update consists of mocks that are used by the rw-core
during unit testing.  It also includes interfaces used for unit
tests.

Change-Id: I20ca1455c358113c3aa897acc6355e0ddbc614b7
diff --git a/vendor/github.com/json-iterator/go/.codecov.yml b/vendor/github.com/json-iterator/go/.codecov.yml
new file mode 100644
index 0000000..955dc0b
--- /dev/null
+++ b/vendor/github.com/json-iterator/go/.codecov.yml
@@ -0,0 +1,3 @@
+ignore:
+    - "output_tests/.*"
+