Hello,

Tested on poky hash 152914f2983c5d69001de1d46ce99547fa1e75fe

All our auto-testing env. is down because of "import bb" inside commands.py. 
On our auto-test env. we have a script inside build dir. that uses commands.py  module.

Steps to reproduce:

1) cd to poky dir. and source env. 
2) inside build dir. edit a test.py file and insert:

sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), '..', 'meta/lib')))
from oeqa.utils.commands import Command, runCmd, get_bb_var, get_test_layer, bitbake

3) python test.py and the result is:
"
...
meta/lib/oeqa/utils/commands.py", line 21, in <module>
    import bb
ImportError: No module named bb
"

With no "import bb" inside commands.py works fine (tested on an earlier commit: 5b12268f6e17574999f91628a60e21711cf62ee4)