multipath.conf defaults section not being obeyed in RHEL

Issue

• Options defined in multipath.conf defaults section not being obeyed in RHEL

• Changes to the path_selector option in defaults section not getting applied
  For example.
  Added below entry for service-time 0 path selector in defaults section of /etc/multipath.conf:

  $ less /etc/multipath.conf
  ...
  defaults {
          polling_interval        5
  ...
          path_selector           "service-time 0"
          getuid_callout          "/sbin/scsi_id --whitelisted --device=/dev/%n"
          }
  ...
  

  But even after multipathd reload, multipath -ll shows round-robin 0 as path selector:

  data (12334556027be3ac0) dm-9 3PARdata,VV
  size=200G features='0' hwhandler='0' wp=rw
  `-+- policy='round-robin 0' prio=1 status=active      <-----
    |- 2:0:0:8  sdj  8:144   active ready running
    |- 1:0:0:8  sdbz 68:208  active ready running
    |- 2:0:1:8  sdar 66:176  active ready running
    `- 1:0:1:8  sddh 70:240  active ready running