scripts: west: introduce common runner configuration

Continue better integration of the runner subpackage into west by
moving the common runner configuration options into the command
core. This allows commands like "west flash -h" to display help for
common overrides like --kernel-hex.

Adjustments needed to make this happen are:

- Change the build system to separate common configuration values from
  runner-specific options and arguments

- Prepare the runner core by defining a new RunnerConfig class that
  represents the common configuration, and accepting that from a new
  create() method, which replaces create_from_args().

- Convert all concrete runner classes to use the new style of
  argument parsing and initialization.

- Group the command options appropriately for help output readability

There's still a bit of tool-specific stuff in the common
configuration (gdb and openocd configuration in particular); a more
generic way to deal with that will be necessary to better support
things like non-GDB debuggers, but that's out of scope of this patch.

All the runner-specific options are still in the runner packge, which
currently prevents them from being included in "west flash -h" etc.
Fixing that is also out of scope of this patch.

This has the ancillary benefit of getting rid of the legacy 'debug'
argument to ZephyrBinaryRunner, which is no longer appropriate since
verbose debug logging is handled by log.py in west.

Signed-off-by: Marti Bolivar <marti@opensourcefoundries.com>

scripts/meta/west/runner/dfu.py

@@ -19,9 +19,9 @@ DfuSeConfig = namedtuple('DfuSeConfig', ['address', 'options'])
 class DfuUtilBinaryRunner(ZephyrBinaryRunner):
     '''Runner front-end for dfu-util.'''
 
-    def __init__(self, pid, alt, img, exe='dfu-util',
-                 dfuse_config=None, debug=False):
-        super(DfuUtilBinaryRunner, self).__init__(debug=debug)
+    def __init__(self, cfg, pid, alt, img, exe='dfu-util',
+                 dfuse_config=None):
+        super(DfuUtilBinaryRunner, self).__init__(cfg)
         self.alt = alt
         self.img = img
         self.cmd = [exe, '-d,{}'.format(pid)]
@@ -67,9 +67,9 @@ class DfuUtilBinaryRunner(ZephyrBinaryRunner):
                             help='dfu-util executable; defaults to "dfu-util"')
 
     @classmethod
-    def create_from_args(cls, args):
+    def create(cls, cfg, args):
         if args.img is None:
-            args.img = args.kernel_bin
+            args.img = cfg.kernel_bin
 
         if args.dfuse:
             args.dt_flash = True  # --dfuse implies --dt-flash.
@@ -79,9 +79,8 @@ class DfuUtilBinaryRunner(ZephyrBinaryRunner):
         else:
             dcfg = None
 
-        return DfuUtilBinaryRunner(args.pid, args.alt, args.img,
-                                   exe=args.dfu_util, dfuse_config=dcfg,
-                                   debug=args.verbose)
+        return DfuUtilBinaryRunner(cfg, args.pid, args.alt, args.img,
+                                   exe=args.dfu_util, dfuse_config=dcfg)
 
     def find_device(self):
         cmd = list(self.cmd) + ['-l']