userportal, webadmin: upgrade gwtbootstrap3 to 0.8.1

Upgrade gwtbootstrap3 from 0.6 to 0.8.1. This upgrade was waiting
for GWT 2.6, on which it is dependent.

For the features we are currently using, this new version appears
to be drop-in compatible.

gwtbootstrap3 0.8.1 adds previously unimplemented features of
bootstrap, such as a Tooltip widget.

Change-Id: I3cc3a7119723b32bed2ac42f02b6035d1cce22df
Signed-off-by: Greg Sheremeta <gshereme@redhat.com>