parse-bzimage: print kernel version string

Print the kernel version string.

Screenshot:

mcgrof@ergon ~/devel/table-init (git::master)$ ./parse-bzimage
~mcgrof/linux/arch/x86/boot/bzImage
kernel: /home/mcgrof/linux/arch/x86/boot/bzImage
kernel size:    5668224 bytes
Going to parse kernel...

-------------------------------------------------
Kernel version: 4.4.0-rc1-1-default+ (mcgrof@ergon.do-not-panic.com) #215 SMP PREEMPT Tue Nov 17 15:48:54 PST 2015
-------------------------------------------------
Xen Expects:    0x53726448
Qemu Expects:   0x53726448
On image:       0x53726448

bzImage protocol Version: v2.13
Xen hdr->version:       525
Qemu protocol:          525
Qemu VERSION(2,8):      520

-------------------------------------------------
Boot protocol 2.07:     0x0207  (supports hardware_subarch)
Boot protocol 2.08:     0x0208
Boot protocol 2.09:     0x0209
Boot protocol 2.10:     0x020a
Boot protocol 2.11:     0x020b
Boot protocol 2.12:     0x020c
Boot protocol 2.13:     0x020d

Member                                  Offset  Expected        Match
-------------------------------------------------------------------------
setup_header->loadflags                 0x0211  0x0211          YES
setup_header->hardware_subarch          0x023c
setup_header->hardware_subarch_data     0x0240

Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>