- improved handling sphinx in configure.ac
- adjusted hammer with new deps for docs
- updated docs about new deps for docs

- added support for fedora 30
- improved creating system boxes
- fixed installing cassandra and postgres dependencies on fedora 30

- improved updating box when there is newer available
- improved pkgs installation by skipping installing when pkgs are already present
- added uploading prepared base kea box to vagrant cloud
- added measuring time of preparation
- completed installing and configuring posgresql on debian and old ubuntu
- fixed installing cassandra on centos 7
- added aggregating unit test results

- simplified differentiating for IP version and exchange types
- added more comments
- fixed unittest for receiver by mocking socket
- added option for building perfdhcp by hammer
- added workaround for compiler bug that cannot handle enum class
  as a key to std::unordered_map
- hidden warnings from boost by changing compiler flag
  from -I<boost-path> to -isystem <boost-path>
- removed unused options_ field from StatsMgr class

[#372,!181] hammer: reduced line lenghts, added docstrings, unified naming, fixed terminating timed out process

- added comments and documentation,
- added missing passing env to execute calls,
- fixed checking revision,
- removed unnecessary code