Adapt configuration and tutorials to support CIDR notation

Changes

• Adapt the config files with the new configuration for CIDR (see oai-cn5g-smf!212 (merged), oai-cn5g-common-src!19 (merged))
• Adapt the sytanx in the increaseDnnRange.py file
• Change UE IP from 12.1.1.129 to 12.1.1.130 in slicing scenario (.128 is the network IP, .129 is reserved for GW, so .130 should be the first)

@defosseu I only tested the slicing tutorial manually, not the loadtest, but I checked if the script replaces the values correctly.

@defosseu @kharade After we move UPF to YAML config as well, we could rewrite that script and just change the values directly with pyyaml, it is less maintenance intense than replacing it based on regex matches