py3: handle opts correctly for `hg add` opts in add command were passed again to cmdutil.add() as kwargs so we need to convert them again to str. Intstead we convert them to bytes when passing scmutil.match(). Opts handling is also corrected for all the functions which are called from cmdutil.add().

py3: handle opts correctly for rollback dryrun and force are just check for None, the value is not used. So its better to leave opts as unicodes as that wont harm us.

py3: handle opts correctly for unbundle There is just a check whether the value is None or not. So even having optupdate as unicodes won't harm us.

py3: convert opts to bytes in cmdutil.dorecord() commands.commit() calls cmdutil.dorecord() where opts are passed as unicodes being keyword arguments. This patch converts them back to bytes as they are required.