Fixes busser install for older omnibus windows installs #1003
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This fixes test-kitchen/busser#25
Older (chef 11) omnibus installs on Windows do not propogate the the changes to the path so commands made in the same kitchen run will not have the chef embedded bin on the path. This is exacerbated by older versions of rubygems like the one that ships with chef 11 where the binstubs do not include an absolute path to the ruby interpreter. As a result he busser installer cannot find ruby.exe.
This was fixed for the provisioners in this commit, but alas, the busser still breaks.
This pr centralizes the
reload_ps1_path
method and uses it in the busser installer.