Various distccd related improvements, mostly respect --verbose

Created by: ollieparanoid

I've done some refactoring while debugging #209 (closed).

• Unused file pmb/build/crosscompiler.py removed (that was a left over from the now obsolete _pmb_build_in_native_chroot hack)
• Do verbose logging in distccd, when pmbootstrap --verbose is being invoked
• Restart distccd, when the commandline has changed (e.g. when the currently running version was not verbose, and the new one is verbose.) Prior to this change, it only got restarted, when the architecture changed (so it did not allow changing the job count on the fly for example).
• Insert missing whitespace in arguments help.