System fails to reboot automatically, dropping to debug shell on shutdown

Issue

• When initiating a reboot command, the system shut downs but drops into a debug shell, complaining about missing binaries, as shown in the example below

  /shutdown: line 115: reboot: command not found
  [  145.951127] dracut Warning: reboot failed!
  dracut Warning: reboot failed!
  
  [  145.953007] dracut Warning: 
  dracut Warning: 
  
  Generating "/run/initramfs/rdsosreport.txt"
  You might want to save "/run/initramfs/rdsosreport.txt" to a USB stick or /boot
  after mounting them and attach it to a bug report.
  
  To get more debug information in the report,
  reboot with "rd.debug" added to the kernel command line.
  
  Dropping to debug shell.
  
  shutdown:/# 
  

• Upon system installation using a DVD image mounted as a virtual DVD on the hardware's Management Console (e.g. HP iLO), Anaconda drops into a debug shell, as shown in the example below

  /lib/dracut/hooks/shutdown/20-multipath-shutdown.sh: line 3: multipath: command not found
  
  /shutdown: line 115: reboot: command not found
  [  145.951127] dracut Warning: reboot failed!
  dracut Warning: reboot failed!
  
  [  145.953007] dracut Warning: 
  dracut Warning: 
  
  Generating "/run/initramfs/rdsosreport.txt"
  You might want to save "/run/initramfs/rdsosreport.txt" to a USB stick or /boot
  after mounting them and attach it to a bug report.
  
  To get more debug information in the report,
  reboot with "rd.debug" added to the kernel command line.
  
  Dropping to debug shell.
  
  shutdown:/#