internal.py: nitty little spelling error
internal.py: nitty little spelling error

Signed-off-by: Dan Mick <b07550071eaa6a9296289c43bbd6c90559196431@inktank.com>

ivotron/teuthology,caibo2014/teuthology,zhouyuan/teuthology,t-miyamae/teuthology,michaelsevilla/teuthology,dreamhost/teuthology,t-miyamae/teuthology,yghannam/teuthology,ivotron/teuthology,zhouyuan/teuthology,tchaikov/teuthology,dmick/teuthology,tchaikov/teuthology,caibo2014/teuthology,dreamhost/teuthology,dmick/teuthology,ktdreyer/teuthology,michaelsevilla/teuthology,ceph/teuthology,robbat2/teuthology,robbat2/teuthology,dmick/teuthology,yghannam/teuthology,ktdreyer/teuthology,SUSE/teuthology,SUSE/teuthology,ceph/teuthology,SUSE/teuthology