CLOUDSTACK-4283: remove hardcoded shared_vlan from test_shared_networks

SharedNetwork creation requires a pre-setup VLAN outside of the guest
VLANs defined during zone creation. Use a VLAN tag outside the guest
range as a shared network vlan to create shared networks.

Signed-off-by: Prasanna Santhanam <tsp@apache.org>
(cherry picked from commit 35867ccbd90c824b4faae438dac99400babeff95)
CLOUDSTACK-4268: Guest OS category of Other Ubuntu 32 bit is different in a fresh setup and
a setup upgraded from 4.1 to 4.2. Fixed the category id for Ubuntu on clean setup. Also made
change to address the problem for upgrade from 2.x.
CLOUDSTACK-4279. Usage manager - Parameter index out of range error