fix link error, rename default pre loaded image, change formating for config function description
fix link error, rename default pre loaded image, change formating for config function description

JIRA: FUNCTEST-10

Change-Id: Iea91b80ccf806cf08d5455bf45b8608f5c9c324d
Signed-off-by: morganrOL <863ecccd07b4194c40ddc432b982c8c67e56599a@orange.com>

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