Add api lint to upload checks

Currently will never block upload, only considered a warning, but
will print out any lint issues discovered.

Test: do an upload
Bug: 69115822
Change-Id: I69b8e5a3f92ac28ee3c954408e88a1056c33af65
diff --git a/tools/apilint/apilint.py b/tools/apilint/apilint.py
index 2eab22e..c9f3199 100644
--- a/tools/apilint/apilint.py
+++ b/tools/apilint/apilint.py
@@ -1371,7 +1371,9 @@
             print
         """
 
-    print "%s API style issues %s\n" % ((format(fg=WHITE, bg=BLUE, bold=True), format(reset=True)))
-    for f in sorted(cur_fail):
-        print cur_fail[f]
-        print
+    if len(cur_fail) != 0:
+        print "%s API style issues %s\n" % ((format(fg=WHITE, bg=BLUE, bold=True), format(reset=True)))
+        for f in sorted(cur_fail):
+            print cur_fail[f]
+            print
+        sys.exit(77)