contrib/kyua: update to 0.15.0

This new release contains multiple feature updates and bugfixes. Please
see the release notes mentioned in the merge commit for more details.

MFC after: 1 month
Merge

contrib/kyua: update to 0.15.0

This new release contains multiple feature updates and bugfixes. Please
see the release notes mentioned in the merge commit for more details.

MFC after: 1 month
Merge commit '144afd05f8a2300361ec30c1c2020e4022ddd943'

Conflicts:
contrib/kyua/cli/cmd_debug.cpp
contrib/kyua/doc/kyua-debug.1.in
contrib/kyua/doc/kyuafile.5.in
contrib/kyua/engine/config.cpp
contrib/kyua/engine/execenv/execenv.cpp
contrib/kyua/engine/execenv/execenv.hpp
contrib/kyua/engine/execenv/execenv_host.hpp
contrib/kyua/engine/requirements.cpp
contrib/kyua/engine/requirements.hpp
contrib/kyua/engine/scheduler.cpp
contrib/kyua/model/metadata.cpp
contrib/kyua/os/freebsd/execenv_jail.hpp
contrib/kyua/os/freebsd/execenv_jail_stub.cpp
contrib/kyua/os/freebsd/main.cpp
contrib/kyua/os/freebsd/reqs_checker_kmods.cpp
contrib/kyua/os/freebsd/utils/jail.hpp
contrib/kyua/utils/fs/directory.cpp
contrib/kyua/utils/process/executor.cpp

show more ...