This patch includes the following changes:
* Instead of the uploadFile action, this patch uses uploadImageCommon
to be able to support both Advantech WebAccess builds: 2014 and
2015.
* It uses an explicit check instead of the passive version check.
* It cleans up the malicious file after getting a session.
* Added module documentation to explain the differences between
different builds of Advantech WebAccess 8.0s, and 8.1.
Fix#6872
William Webb