user cant custom their session expire time #3633

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Issue Description

Describe your issue in as much detail as possible.

Steps to reproduce

ParseSession.getCurrentSessionInBackground(new GetCallback<ParseSession>() { public void done(ParseSession ps, ParseException e) { if (e == null) { ps.put("device", Build.MODEL); ps.put("app", getPackageName()); Calendar cal = Calendar.getInstance(); cal.add(Calendar.MINUTE, 15); ps.put("expiresAt", Calendar.getInstance()); ps.saveEventually(new SaveCallback() { public void done(ParseException e) { if (e == null) { Log.i(TAG, "parse session sucesse"); } else { Log.i(TAG, "parse session not sucess"); } } }); } else { Log.i(TAG, "cant get parse session"); } } });

Please include a detailed list of steps that reproduce the issue. Include curl commands when applicable.

Expected Results

What you expected to happen.

Actual Outcome

What is happening instead.
"User cannot modify readonly attribute: exipresAt"

Environment Setup

• Server

  • parse-server version (Be specific! Don't say 'latest'.) : 2.3.6
  • Operating System: [FILL THIS OUT]
  • Hardware: [FILL THIS OUT]
  • Localhost or remote server? (AWS, Heroku, Azure, Digital Ocean, etc): [FILL THIS OUT]

• Database

  • MongoDB version: [FILL THIS OUT]
  • Storage engine: [FILL THIS OUT]
  • Hardware: [FILL THIS OUT]
  • Localhost or remote server? (AWS, mLab, ObjectRocket, Digital Ocean, etc): [FILL THIS OUT]

Logs/Trace

Include all relevant logs. You can turn on additional logging by configuring VERBOSE=1 in your environment.