openpli.conf: remove ipv6 from the distro features
openpli.conf: remove ipv6 from the distro features

ipv6 is breaking some packages (enigma2 wireless lan plugin for instance)
So for now, do not put ipv6 support in our images.

openpli-arm/openembedded,BlackPole/bp-openembedded,openpli-arm/openembedded,openpli-arm/openembedded,openpli-arm/openembedded,libo/openembedded,BlackPole/bp-openembedded,openpli-arm/openembedded,SIFTeam/openembedded,libo/openembedded,libo/openembedded,BlackPole/bp-openembedded,SIFTeam/openembedded,libo/openembedded,nx111/openembeded_openpli2.1_nx111,openpli-arm/openembedded,BlackPole/bp-openembedded,nx111/openembeded_openpli2.1_nx111,BlackPole/bp-openembedded,openpli-arm/openembedded,SIFTeam/openembedded,nx111/openembeded_openpli2.1_nx111,nx111/openembeded_openpli2.1_nx111,nx111/openembeded_openpli2.1_nx111,SIFTeam/openembedded,libo/openembedded,BlackPole/bp-openembedded,SIFTeam/openembedded,nx111/openembeded_openpli2.1_nx111,nx111/openembeded_openpli2.1_nx111,libo/openembedded,SIFTeam/openembedded,SIFTeam/openembedded,BlackPole/bp-openembedded,libo/openembedded,nx111/openembeded_openpli2.1_nx111