Bump up swagger ui from 2.1.4 to 2.1.5

This commit bumps up swagger ui to 2.1.5 which fixes various bugs
of swagger ui 2.1.4.

Change-Id: I4f8d7f79b88cddada0148a8629e7ef4da9eac3a0
diff --git a/web/api/src/main/resources/docs/lib/highlight.9.1.0.pack.js b/web/api/src/main/resources/docs/lib/highlight.9.1.0.pack.js
new file mode 100755
index 0000000..928386d
--- /dev/null
+++ b/web/api/src/main/resources/docs/lib/highlight.9.1.0.pack.js
@@ -0,0 +1,2 @@
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