Remove -b from default rspec options
Remove -b from default rspec options

RSpec seems to be much better at filtering nowadays and the extra lines
are a PITA in development.

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