Pass the kernel's task port to proc.

Previously, the early server bootstrap relied upon a specific task
layout to determine the kernels task port.  Explicitly pass it from
the kernel instead.

* boot/boot.c (default_boot_script): Add '--kernel-task' parameter to
ext2fs.
(main): New bootscript variable 'kernel-task'.
* libdiskfs/boot-start.c (diskfs_kernel_task): Declaration variable.
(diskfs_start_bootstrap): If '--kernel-task' was given to us, pass it
along to startup.
* libdiskfs/opts-std-startup.c (diskfs_kernel_task): New variable.
(startup_options): Add '--kernel-task' option.
(parse_startup_opt): Handle option.
* proc/main.c (kernel_task): New variable.
(OPT_KERNEL_TASK): New macro.
(options): New variable.
(parse_opt): New function.
(main): Parse options.  Use 'kernel_task' if provided.
* release/servers.boot: Add '--kernel-task' parameter to ext2fs.
* startup/startup.c (OPT_KERNEL_TASK): New macro.
(options): Add '--kernel-task' option.
(kernel_task): New variable.
(insert_ports_fnc_t): New declaration.
(run): Add argument for a function that inserts rights into the newly
created task and adds arguments to the argument vector.
(argz_task_insert_right): New function.
(proc_insert_ports): Likewise.
(parse_opt): New function.
(main): Pass the kernel's task port to proc.
(frob_kernel_process): Use the kernel's task port.

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