Pass admin_user/password/token/tenant_name in fabfile command reading the fabfile while installing webui

Change-Id: Iebe85a120af452f960cde7c6e08f03767dbaf258
(cherry picked from commit 940f05a7d2b9c21c8ef9d3a7ea68d8bfe51e5832)
Merge "Pass admin_user/password/token/tenant_name in fabfile command reading the fabfile while installing webui" into R2.0