[BuildMonitor] Add to set the stage_status as 'S' at the 'Base' snapshot stage

[BuildMonitor] Add to set the stage_status as 'S' at the 'Base' snapshot stage

1. [job_buildmonitor.py]
  Set the stage_status(PRE_SNAP & PRE_IMAGE / POST_SNAP & POST_IMAGE)
  as 'S(uccedded)' at the snapshot stage of 'Base' project

  << Modified functions >>
  1-1. Pre release part
    update_fail_status_for_sr_stage(...)
    end_pre_create_snapshot_for_sr_stage(...)

  1-2. Post release part (need 'multi_sr_status_id')
    update_fail_create_snapshot_for_sr_stage(...)
    end_create_snapshot_create_images_for_sr_stage(...)

2. [job_create_snapshot.py]
  2-1. Add to Skip [BUILD-MONITOR_Post_Image] if Base project
  2-2. Remove the legacy code ('buildmonibor_skip')

Change-Id: I2776abcc10436f778483181e839e888df44e15a3
Signed-off-by: SungHun Hwang <sh0924.hwang@samsung.com>