build.py: bugfix: incorrect determination of hostarch available for build

 * x86-64 should be able to build for i586 hostarch but it doesn't.
Merge pull request #12 from a-sidorin/sidorin4review

build.py: bugfix: incorrect determination of hostarch available for build
- parse_repoarchdescr: there's no need to use os.path.basename
- parse_repoarchdescr: also glob for a PKGBUILD file

There's no guessing for arch's PKGBUILD files (the backend
does not do any guessing, too)
- request_interactive_review: support "-f" parameter to force a request state change
- do_repairlink: support "osc repairlink prj/pkg" syntax
- fix search OBS api call /search/project_id should /search/project/id (bnc#769948)
- support prefer pkgs for kiwi builds
- add support for delete requests.
support single binary download via getbinaries command
- avoid crashes for requests without repository target
- support default maintainer/bugowner search based on binary package names
- support to set the bugowner
- offer to send set_bugowner request if target is not writeable
- bugowner call is just an alias for maintainer call now
- mention the --all feature
- buildinfo --debug  option for verbose output of dependency calculation
- version 0.137
- open 0.138 development
add support to remove repositories recursively (mostly only usefull for admins)
- added support to strip the build time from the buildlog when running "bl", "rbl", "lbl"

Also added a config option "buildlog_strip_time" to permanently enable/disable the
stripping of the build time.
- do_maintainer: support "osc maintainer prj/pkg" syntax