Fixing bad default setting - if ENV is not set we are accidently setting log_level to nil for whole run #633
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This is a follow up to https://github.com/test-kitchen/test-kitchen/pull/600/files, which introduced a bug. Not setting ENV[:log_level] causes the converge step to fail because we create the provisioner string
chef-client --log-level
with no supplied log level.\cc @fnichol @schisamo