Address missing field initializer warnings.
These were rtems_shell_cmd_t or rtems_shell_alias_t declarations
with initialization. The initialization was changed to using named
fields.
Updates #5325.
- Add `printk` support to aid multi-core debugging.
- Add lock trace to aid lock debugging.
- Fixes to gcc-7.1 warnings.
- Fixes from ticket #2879.
- Add verbose command controls.
- Change using the RTEMS sys/lock.h API to manage exception threads.
- ARM hardware breakpoint fixes. Support for SMP stepping
is not implemented, this requires use of the context id
register.
Closes#2879.
