When deploying on debian, it reports error:
stat /usr/bin/ansible: no such file or directory
That's because on Debian and Ubuntu pip install ansible to
/usr/local/bin/ansible, whereas on CentOS the location is
/usr/bin/ansible.
Change to ansible to handle both cases.
Closes-Bug: #1729216
Depends-On: I2b57403128bc103148ae696c219df52590214adc
Change-Id: I025037cf48596450e6479ab7ff6425c48ac73aad
Signed-off-by: Xinliang Liu <xinliang.liu@linaro.org>