Clear __init__.py from cmd move

I accidentally dropped the clearing of this file when it moved to
cmd.py during rebase of I1919f6e865acae14ee95cd025c9c7b75ca266a9c

Change-Id: Ibe9fcde594770cb51c732cc253987308dc038083

diskimage_builder/block_device/__init__.py

@@ -1,70 +0,0 @@
-# Copyright 2016-2017 Andreas Florath (andreas@florath.net)
-#
-# Licensed under the Apache License, Version 2.0 (the "License"); you may
-# not use this file except in compliance with the License. You may obtain
-# a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-# License for the specific language governing permissions and limitations
-# under the License.
-
-import argparse
-import logging
-
-from diskimage_builder.block_device.blockdevice import BlockDevice
-from diskimage_builder import logging_config
-
-
-def generate_phase_doc():
-    phase_doc = ""
-    bdattrs = dir(BlockDevice)
-    for attr in bdattrs:
-        if attr.startswith("cmd_"):
-            phase_doc += "  '" + attr[4:] + "'\n"
-            method = getattr(BlockDevice, attr, None)
-            # The first line is the line that is used
-            phase_doc += "    " + method.__doc__.split("\n")[0] + "\n"
-    return phase_doc
-
-
-def main():
-    logging_config.setup()
-    logger = logging.getLogger(__name__)
-    phase_doc = generate_phase_doc()
-
-    parser = argparse.ArgumentParser(
-        formatter_class=argparse.RawDescriptionHelpFormatter,
-        description="Create block device layer",
-        epilog="Available phases:\n" + phase_doc)
-    parser.add_argument('--phase', required=True,
-                        help="phase to execute")
-    parser.add_argument('--params', required=True,
-                        help="parameters for block device handling")
-    parser.add_argument('--symbol', required=False,
-                        help="symbol to query for getval")
-    args = parser.parse_args()
-
-    logger.info("phase [%s]" % args.phase)
-    logger.info("params [%s]" % args.params)
-    if args.symbol:
-        logger.info("symbol [%s]" % args.symbol)
-
-    bd = BlockDevice(args)
-
-    # Check if the method is available
-    method = getattr(bd, "cmd_" + args.phase, None)
-    if callable(method):
-        # If so: call it.
-        return method()
-    else:
-        logger.error("phase [%s] does not exists" % args.phase)
-        return 1
-
-    return 0
-
-if __name__ == "__main__":
-    main()