Add 'check if file exists' when creating the glance image
Add 'check if file exists' when creating the glance image

Change-Id: I2f61d130ac49ca0cc6bdde6b3da209ec37f24452
Signed-off-by: jose.lausuch <a4ed9890ad7f6494ac84a749f29a4dc3449a1186@ericsson.com>

opnfv/functest,mywulin/functest,opnfv/functest,mywulin/functest