awk -F: '
NR==1           {HD = "insert_job,machine,date_conditions,days_of_week,start_time,timezone,description,command,alarm_if_fail"
                 for (HDCnt=i=split(HD, HDArr, OFS); i>0; i--) SRCH[HDArr[i]] 
                 print HD
                }

function PRT()  {for (i=1; i<=HDCnt; i++)       {printf "%s%s", RES[HDArr[i]], i<HDCnt?OFS:ORS
                                                }
                 split ("", RES)
                }

/--- JOB/       {if (PR) PRT()
                 PR=1
                }

$1 in SRCH      {T = $1
                 sub ($1 FS " *", "")
                 sub (/  +.*$/, "")
                 RES[T] = $0
                }

END             {PRT()
                }
' OFS=","  file
insert_job,machine,date_conditions,days_of_week,start_time,timezone,description,command,alarm_if_fail
JOB1,,1,mo,tu,we,th,fr,su,"18:30",US/Eastern,"pull files",,1
JOB2,machine@conti.com,,sa,su,,GMT,"pull all files",/usr/bin/run /usr/cache/START_JOB,1