Fix the following runtime issue of pip:
# pip
Traceback (most recent call last):
File "/usr/bin/pip", line 5, in <module>
from pkg_resources import load_entry_point
ImportError: No module named pkg_resources
Signed-off-by: Zhenhua Luo <zhenhua.luo@freescale.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>