Don't pretty print json files

The json file outputs of e-r are loaded by web browsers in order to
render our graphs. These json files are actually quite large and part of
the reason why is we pretty print them with 4 space indents and they
have large nesting. Stop pretty printing (humans can pass the files
through a filter if necessary) in order to reduce the size of these
files and make browsers happier (less time spent downloading).

Change-Id: I19dedc2994169932eb0e90b6cdea3856637f5ef0

elastic_recheck/cmd/graph.py

@@ -243,9 +243,7 @@ def main():
         out = sys.stdout
 
     try:
-        # indent the json output if we're writing to a file
-        indent = 4 if args.output else None
-        out.write(json.dumps(jsondata, indent=indent))
+        out.write(json.dumps(jsondata))
     finally:
         out.close()