bootzip: fix up issues with bootzip creator

Allow for modules to be a symlink (as seen with qcom wlan)
If the kernel version is blank, call it Gummy-*

Change-Id: Id85618437904cb6e2bcb8013f4c50577044ce344
SaberDroid all the things!

Signed-off-by: cj360 <ayunker551@gmail.com>