add support for custom seed in Ubuntu/Debian BootEnvs
Created by: sygibson
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modifies debian-8, debian-9, and ubuntu-16.04 to use "seed" of "select-seed.tmpl"
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adds "select-seed.tmpl" which by default uses the original "net-seed.tmpl, or the operators provided template seed file
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adds param of "select-seed" which can be used on Machines or Profiles to specify a custom seed to use
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tested with ubuntu-16.04, debian-8, and debian-9 BootEnvs