(PDK-475) Set BUNDLE_IGNORE_CONFIG for all commands

[rodjek]

This will prevent any ~/.bundle/config or related config files that may exist from effecting how the PDK uses bundler.

[DavidS]

Works for me:

david@davids:~/tmp/blubb3$ pdk test unit
pdk (INFO): Using Ruby 2.4.4
pdk (INFO): Using Puppet 5.5.1
[✖] Preparing to run the unit tests.
pdk (ERROR): The spec_prep rake task failed with the following error(s):

/opt/puppetlabs/pdk/private/ruby/2.4.4/lib/ruby/gems/2.4.0/gems/bundler-1.16.1/lib/bundler/rubygems_integration.rb:458:in `block in replace_bin_path': can't find executable rake for gem rake. rake is not currently included in the bundle, perhaps you meant to add it to your Gemfile? (Gem::Exception)
	from /opt/puppetlabs/pdk/private/ruby/2.4.4/lib/ruby/gems/2.4.0/gems/bundler-1.16.1/lib/bundler/rubygems_integration.rb:489:in `block in replace_bin_path'
	from /home/david/tmp/blubb3/bin/rake:29:in `<main>'

[✖] Cleaning up after running unit tests.
pdk (ERROR): The spec_clean rake task failed with the following error(s):

/opt/puppetlabs/pdk/private/ruby/2.4.4/lib/ruby/gems/2.4.0/gems/bundler-1.16.1/lib/bundler/rubygems_integration.rb:458:in `block in replace_bin_path': can't find executable rake for gem rake. rake is not currently included in the bundle, perhaps you meant to add it to your Gemfile? (Gem::Exception)
	from /opt/puppetlabs/pdk/private/ruby/2.4.4/lib/ruby/gems/2.4.0/gems/bundler-1.16.1/lib/bundler/rubygems_integration.rb:489:in `block in replace_bin_path'
	from /home/david/tmp/blubb3/bin/rake:29:in `<main>'

pdk (FATAL): Failed to clean up after running unit tests
david@davids:~/tmp/blubb3$ cat .bundle/config 
---
BUNDLE_PATH: "~/gems"
BUNDLE_JOBS: "4"
BUNDLE_WITHOUT: "development"
david@davids:~/tmp/blubb3$ ~/git/pdk/bin/pdk test unit
pdk (INFO): Using Ruby 2.5.1
pdk (INFO): Using Puppet 5.5.1
[✔] Installing missing Gemfile dependencies.
[✔] Preparing to run the unit tests.
[✔] Running unit tests.
  Evaluated 5 tests in 0.042942744 seconds: 0 failures, 0 pending.
[✔] Cleaning up after running unit tests.
david@davids:~/tmp/blubb3$ ~/git/pdk/bin/pdk --version
1.6.0.pre (heads/pdk-475-0-geefced2)
david@davids:~/tmp/blubb3$ 

[coveralls]

Coverage increased (+0.003%) to 92.862% when pulling eefced2 on rodjek:pdk-475 into d1757f4 on puppetlabs:master.