Implement a ballooning mechanism in L4Linux similar to solutions like XEN's
balloon driver. Therefore the new parent interface extensions for requesting
and yielding resources are used. L4Linux registers a yield signal context at
its parent. Whenever the parent triggers a yield, the balloon driver blows up,
which means it requests all pages available, and then frees the corresponding
backend memory.
Make calls using IPCs IRQ safe, handle packet exhaustion, removed
'Packet_pool', tweak TCP rmem and wmem buffer sizes to show better performance
results, use 'Net::Packet_allocator, fix 'update-patch' Makefile command