fixing issue with rake katello:reset every other run

The initial user would attempt to be created in pulp with a blank
oauth header.  Since this is being done in the foreman seeds, there is little
we can do about it, so this forces use of the default admin user
fixing `undefined method 'can_do_shell_command'`
Merge pull request #3590 from komidore64/about-method-fix

fixing `undefined method 'can_do_shell_command'`
Merge pull request #3584 from jlsherrill/reset-fix

fixing issue with rake katello:reset every other run