[FEATURE: #314] userspace/host_tools: add dot-config converter from 6.x to 7.0

Converter script can be run:
- on WRS
- in the repo directory (userspace/host_tools/dot-config_converter_6_x_to_7_0.sh)
- in standalone mode (run "make converter_standalone" to prepare it)

Signed-off-by: Adam Wujek <dev_public@wujek.eu>