beagle bsp: disable watchdog on am335x

On recent u-boots, the watchdog is turned on / left enabled. The
Beaglebone Black rev. C ships with such a u-boot internally so any
application booting from it must disable the watchdog.

Therefore this change is needed to boot an RTEMS app out-of-the-box
on a BBB Rev C - otherwise the user button must be held during boot
(to bypass the stock uboot) or the internal uboot must be updated. To
allow for a better out-of-the-box experience, we just turn off the
watchdog.
libmisc: More useful default configuration

The dummy.c was a de-facto default configuration.  Rename it to
default-configuration.c.  Use unlimited objects and the stack checker.
This makes it easier for new RTEMS users which will likely use this file
if they just work with the usual main() function as the application
entry point.  Provide proper arguments for main() using the BSP command
line.  Add spare user extensions and drivers.

Do not initialize the network by default.  Delete bspinit.c.
Update bug report URL
bsps/sparc: Fix trap table initialization

Fixes bug introduced with dff1803cfbec3775fff1b9c34cc707c05494dc3b.
nfsclient: Avoid __FILE__ and __LINE__

The __FILE__ prevents reproducible builds.
shell: Avoid __DATE__ and adjust welcome message

The use of __DATE__ prevents reproducible builds.
libtests/complex: Avoid multiple definitions
sparc64: put each copyright on one line
Teach rtems_tarfs_load() about symlinks
confdefs.h: Fix workspace size if idle task is FP
posix: Simplify _POSIX_Keys_Find()
posix: Delete key/value if value is set to NULL
Add POSIX key value pairs to resource snapshot
shell: Add 'all' topic for help for all commands
libcsupport: Do not use _Assert() for sync()

Use a best-effort approach.
bsp/mpc8xx: Fix warnings

close #2211
doc: Clarify rtems_task_set_priority()
doc: Clarify rate-monotonic statistics
bsp/mpc8xx: Fix warnings

close #2211
bsp/lpc32xx: Fix memory map

Fixes bug introduced with f0c564c5ae36da20b1543ae9db9e8fe9644a81c8.

close #2218