Fix regex for checking private data in statistics

Change regexp for matching data types which can contain
some network information (e.g. public IP network address).
Currently it also matches allowed types of info - used
for deployments 'predefined_networks', 'network_type',
'network_scheme'.

Change-Id: I987ca924f3336b5956707624e00dd1d0238e5d6f
Implements: blueprint fuel-stats-test