Grub2 doesn't support having an ampersand in the arguments list

Issue

• When installing a system via kickstart, if the kickstart line has an "&" in the URL, this is considered a syntax error by Grub;

  error:/../../grub-core.script/lexer.c:352:syntax error.
  error:/../../grub-core.script/lexer.c:352:Incorrect command.
  error:/../../grub-core.script/lexer.c:352:syntax error.
  

• The custom kickstart directive below results in installation failure:

  inst.ks=http://myserver.example.com/kickstarts/provision?token=someUUID&static=yes
  

• The custom Repo URL directive below results in installation failure:

  inst.repo=http://myserver.example.com/distro/provision?token=someUUID&os=rhel8