Extend linux-user syscalls and ioctls

Very often, the QEMU emulator is used to emulate user level processes that are compiled for a different architecture set than the "host" machine on which they are running. This operating mode in QEMU is called the user mode and it is much simpler than the more commonly known system mode in which the full computer system is emulated. The user mode is useful for fast cross execution and debugging and is usually executed on Linux based systems. It achieves this cross execution by having its' own implementations of system functions from the Linux kernel interface. Although many system functions are supported in QEMU, the kernel is constantly extended by addition of new system calls. QEMU user mode can't consistently follow this kernel extension and thus many kernel functions are left unimplemented. The goal of this project is to significantly extend this QEMUs implementation of system functions so that many user programs that depend on these system calls can be safely cross executed. This projects' contribution also extends to the Linux Test Project by developing unit tests for system functions implemented within QEMU.