Commits on Aug 20, 2018

1. Add error handling to utility functions, remove assumptions about hos… …

   …t path.
   
   Most error checking was missing from pkg/bootstrap/node.go.
   Added to all utility functions.
   
   In addition, pkg/bootstrap/node.go made assumptions about
   host-path for binaries (machinectl/qemu-img/mount etc). Remove this.
   If the binaries are not on the PATH, fail. This is the reason
   for Unix PATH, to indicate where to find executables, hard-coding
   fallbacks can create a security issue or astonishment.
   
   The code had a hard-coded assumption that the machine had
   selinux available (e.g. it assumped selinux is enforcing/not-enforcing)
   where there is a 3rd-option (not available). If selinux is not
   available (e.g. Ubuntu-derived hosts), then return false
   from isSELinuxEnforcing().

   

   donbowman committed Aug 20, 2018
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