lot of bugfixes in communication

communication:
 * now the client can detect YumWorker's early termination and restart it
 * session level is counted on client and server side
   - this allows to restore session state, when process is restarted
 * minimized session nesting on server to 1 at max
   - thanks to counter on client side
   - reduces communication traffic
 * improved logging

api changes:
 * PackageInfo's pkgid renamed to objid
 * Repository's name renamed to repoid
   caption renamed to name
 * added include_repos and exclude_repos to YumDB methods, where
   it makes sense

other bugfixes:
 * fixed issues with repo enable
 * assigning None to Instance properties with CIMProperty values
   instead of skipping the value assignment to prevent using
   old reference to value

allowed for repository management
 - enable/disable

allowed to list/filter packages of particular repositories

added filter for packages to match those belonging to repository

testing:
 * improved testing speed using run.py script
 * removed unfinishable tests

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