Fix mid-line command completion
Fix mid-line command completion

Use COMP_CWORD instead of -1 to dynamically decide where to
do completion and what candidates to offer

xcat2/confluent,jjohnson42/confluent,jjohnson42/confluent,xcat2/confluent,xcat2/confluent,jjohnson42/confluent,xcat2/confluent,jjohnson42/confluent,jjohnson42/confluent,xcat2/confluent