[RSPEC] Refactored spec for subprocess that does not close out stdout/stderr
[RSPEC] Refactored spec for subprocess that does not close out stdout/stderr

juliandunn/mixlib-shellout,juliandunn/mixlib-shellout,BackSlasher/mixlib-shellout,docwhat/mixlib-shellout,chef/mixlib-shellout,Nordstrom/mixlib-shellout,docwhat/mixlib-shellout,chef/mixlib-shellout,BackSlasher/mixlib-shellout