webadmin: Prevent VM suspend in the ppc64 arch

This change prevents the suspension of VMs in architectures that do not
support it by disabling the suspend button in the frontend.

Change-Id: Ibe6a5fd5ad1679045582afcc16aebbfba34f7429
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1070189
Signed-off-by: Vitor de Lima <vitor.lima@eldorado.org.br>
Signed-off-by: Gustavo Pedrosa <gustavo.pedrosa@eldorado.org.br>