Merge branch 'server_control' into 'master'

Knot.files

doc/man/knot.conf.5in

doc/man/knotc.8in

doc/man_knotc.rst

doc/reference.rst

python/libknot/__init__.py

python/libknot/control.py

src/Makefile.am

src/knot/conf/confio.c

src/knot/conf/confio.h

src/knot/conf/scheme.c

src/knot/conf/scheme.h

src/knot/ctl/commands.c

src/knot/ctl/commands.h

src/knot/ctl/process.c

src/knot/ctl/process.h

src/knot/ctl/remote.c

src/knot/ctl/remote.h

src/libknot/control/control.c

src/libknot/control/control.h