Enable jqplot charts to be visible in IE8

https://bugzilla.redhat.com/show_bug.cgi?id=1058261
 Enable ziya charts to be visible in IE8

https://bugzilla.redhat.com/show_bug.cgi?id=1058261
Remove Support for VixDiskLib 5.1.0

VixDiskLib 5.1.0 has a known bug intermittently causing a
segfault during disk open operations when the vCenter Server
does not provide an SSL thumbprint for the target host.  The
error depends upon the memory content.  This segfault has been
encountered during testing so support for this version has
been removed.  Only this version has this flaw.

Add capability to easily add other unsupported versions along
with a concise reason to be printed to the log.
Merge pull request #296 from bmclaughlin/ie8-dashboard-widget-fix

Make Dashboard charts visible in IE8
Merge pull request #310 from jerryk55/vddk_remove_5.1.0

Remove Support for VixDiskLib 5.1.0
New method cloneable? to check if VMs/Templates can be cloned or not

issue #253
https://bugzilla.redhat.com/show_bug.cgi?id=1122712