job-list: remove job flags parsing and storing

Problem: The flags from a job's submit event are parsed but
never stored or used.  A field in the job struct is set aside
for it, but it is never initialized.

Solution: Remove the parsing and storing of the flags value.

Author: chu11

src/modules/job-list/job_state.c

@@ -1236,14 +1236,12 @@ static int submit_context_parse (flux_t *h,
 {
     int urgency;
     int userid;
-    int flags;
 
     if (!context
         || json_unpack (context,
-                        "{ s:i s:i s:i }",
+                        "{ s:i s:i }",
                         "urgency", &urgency,
-                        "userid", &userid,
-                        "flags", &flags) < 0) {
+                        "userid", &userid) < 0) {
         flux_log (h, LOG_ERR, "%s: submit context invalid: %ju",
                   __FUNCTION__, (uintmax_t)job->id);
         errno = EPROTO;

src/modules/job-list/job_state.h

@@ -67,7 +67,6 @@ struct job {
     int urgency;
     int64_t priority;
     double t_submit;
-    int flags;
     flux_job_state_t state;
     const char *name;
     int ntasks;