assert_space_available takes optional multiplier arg

Signed-off-by: Mike McClurg <mike.mcclurg@citrix.com>
get_patch_to_local checks filesystem space on slave

Signed-off-by: Mike McClurg <mike.mcclurg@citrix.com>
mkdir -p /var/patch, which might not be there

Signed-off-by: Mike McClurg <mike.mcclurg@citrix.com>