gnrc_ipv6: copy user flags from old netif headers
gnrc_ipv6: copy user flags from old netif headers

Upper layers might want to utilize the flags (e.g. to tell 6LoWPAN to elide
UDP checksums). This change allows for this by copying non-addressing related
flags to the address resolution generated netif header from the user generated
netif header.

kaleb-himes/RIOT,dkm/RIOT,immesys/RiSyn,ks156/RIOT,smlng/RIOT,kb2ma/RIOT,kbumsik/RIOT,kerneltask/RIOT,LudwigKnuepfer/RIOT,LudwigOrtmann/RIOT,avmelnikoff/RIOT,hamilton-mote/RIOT-OS,basilfx/RIOT,adjih/RIOT,hamilton-mote/RIOT-OS,neumodisch/RIOT,BytesGalore/RIOT,basilfx/RIOT,d00616/RIOT,ks156/RIOT,gautric/RIOT,backenklee/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,roberthartung/RIOT,aeneby/RIOT,katezilla/RIOT,tfar/RIOT,cladmi/RIOT,hamilton-mote/RIOT-OS,alignan/RIOT,lazytech-org/RIOT,kerneltask/RIOT,jasonatran/RIOT,aeneby/RIOT,authmillenon/RIOT,tfar/RIOT,dailab/RIOT,LudwigKnuepfer/RIOT,aeneby/RIOT,jfischer-phytec-iot/RIOT,biboc/RIOT,toonst/RIOT,Ell-i/RIOT,katezilla/RIOT,jfischer-phytec-iot/RIOT,adrianghc/RIOT,neumodisch/RIOT,jbeyerstedt/RIOT-OTA-update,RIOT-OS/RIOT,dailab/RIOT,A-Paul/RIOT,immesys/RiSyn,roberthartung/RIOT,mtausig/RIOT,Hyungsin/RIOT-OS,plushvoxel/RIOT,OTAkeys/RIOT,OTAkeys/RIOT,LudwigOrtmann/RIOT,ant9000/RIOT,Ell-i/RIOT,katezilla/RIOT,Hyungsin/RIOT-OS,d00616/RIOT,alignan/RIOT,alignan/RIOT,katezilla/RIOT,x3ro/RIOT,smlng/RIOT,neiljay/RIOT,Josar/RIOT,kaspar030/RIOT,thomaseichinger/RIOT,lazytech-org/RIOT,jbeyerstedt/RIOT-OTA-update,OlegHahm/RIOT,biboc/RIOT,neiljay/RIOT,kbumsik/RIOT,syin2/RIOT,yogo1212/RIOT,kb2ma/RIOT,immesys/RiSyn,foss-for-synopsys-dwc-arc-processors/RIOT,altairpearl/RIOT,Josar/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,neumodisch/RIOT,LudwigOrtmann/RIOT,jasonatran/RIOT,toonst/RIOT,syin2/RIOT,ks156/RIOT,mtausig/RIOT,jfischer-phytec-iot/RIOT,authmillenon/RIOT,Josar/RIOT,backenklee/RIOT,rfuentess/RIOT,syin2/RIOT,adrianghc/RIOT,avmelnikoff/RIOT,d00616/RIOT,dkm/RIOT,thomaseichinger/RIOT,yogo1212/RIOT,mtausig/RIOT,plushvoxel/RIOT,basilfx/RIOT,d00616/RIOT,x3ro/RIOT,rfuentess/RIOT,alignan/RIOT,josephnoir/RIOT,OTAkeys/RIOT,aeneby/RIOT,beurdouche/RIOT,altairpearl/RIOT,LudwigKnuepfer/RIOT,rfuentess/RIOT,jbeyerstedt/RIOT-OTA-update,ant9000/RIOT,immesys/RiSyn,authmillenon/RIOT,OlegHahm/RIOT,RIOT-OS/RIOT,LudwigOrtmann/RIOT,kaleb-himes/RIOT,gebart/RIOT,hamilton-mote/RIOT-OS,mfrey/RIOT,TobiasFredersdorf/RIOT,mtausig/RIOT,miri64/RIOT,jfischer-phytec-iot/RIOT,OTAkeys/RIOT,neumodisch/RIOT,adjih/RIOT,gautric/RIOT,adjih/RIOT,syin2/RIOT,kYc0o/RIOT,josephnoir/RIOT,basilfx/RIOT,x3ro/RIOT,miri64/RIOT,dailab/RIOT,d00616/RIOT,mfrey/RIOT,kYc0o/RIOT,jbeyerstedt/RIOT-OTA-update,aeneby/RIOT,basilfx/RIOT,neumodisch/RIOT,dailab/RIOT,kerneltask/RIOT,cladmi/RIOT,kaspar030/RIOT,Hyungsin/RIOT-OS,kYc0o/RIOT,ant9000/RIOT,altairpearl/RIOT,tfar/RIOT,kaleb-himes/RIOT,kb2ma/RIOT,altairpearl/RIOT,TobiasFredersdorf/RIOT,jasonatran/RIOT,x3ro/RIOT,adrianghc/RIOT,RIOT-OS/RIOT,dkm/RIOT,TobiasFredersdorf/RIOT,kb2ma/RIOT,dkm/RIOT,josephnoir/RIOT,cladmi/RIOT,kaspar030/RIOT,authmillenon/RIOT,neumodisch/RIOT,Ell-i/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,Josar/RIOT,rfuentess/RIOT,ks156/RIOT,gautric/RIOT,adrianghc/RIOT,jfischer-phytec-iot/RIOT,josephnoir/RIOT,hamilton-mote/RIOT-OS,kaspar030/RIOT,A-Paul/RIOT,biboc/RIOT,Josar/RIOT,kYc0o/RIOT,adjih/RIOT,neiljay/RIOT,Hyungsin/RIOT-OS,beurdouche/RIOT,kYc0o/RIOT,smlng/RIOT,kerneltask/RIOT,toonst/RIOT,authmillenon/RIOT,yogo1212/RIOT,mtausig/RIOT,dkm/RIOT,smlng/RIOT,adrianghc/RIOT,plushvoxel/RIOT,neiljay/RIOT,biboc/RIOT,alignan/RIOT,LudwigKnuepfer/RIOT,toonst/RIOT,toonst/RIOT,josephnoir/RIOT,Ell-i/RIOT,beurdouche/RIOT,miri64/RIOT,thomaseichinger/RIOT,OlegHahm/RIOT,thomaseichinger/RIOT,ks156/RIOT,Hyungsin/RIOT-OS,miri64/RIOT,rfuentess/RIOT,plushvoxel/RIOT,gebart/RIOT,gebart/RIOT,A-Paul/RIOT,adjih/RIOT,kaleb-himes/RIOT,altairpearl/RIOT,kbumsik/RIOT,BytesGalore/RIOT,gebart/RIOT,backenklee/RIOT,roberthartung/RIOT,kb2ma/RIOT,avmelnikoff/RIOT,gautric/RIOT,jasonatran/RIOT,katezilla/RIOT,neiljay/RIOT,x3ro/RIOT,A-Paul/RIOT,syin2/RIOT,yogo1212/RIOT,lazytech-org/RIOT,tfar/RIOT,beurdouche/RIOT,smlng/RIOT,kaleb-himes/RIOT,LudwigKnuepfer/RIOT,TobiasFredersdorf/RIOT,miri64/RIOT,authmillenon/RIOT,ant9000/RIOT,d00616/RIOT,avmelnikoff/RIOT,biboc/RIOT,gebart/RIOT,OlegHahm/RIOT,beurdouche/RIOT,altairpearl/RIOT,lazytech-org/RIOT,Ell-i/RIOT,mfrey/RIOT,kaspar030/RIOT,BytesGalore/RIOT,cladmi/RIOT,ant9000/RIOT,kerneltask/RIOT,plushvoxel/RIOT,kbumsik/RIOT,yogo1212/RIOT,LudwigOrtmann/RIOT,jasonatran/RIOT,backenklee/RIOT,tfar/RIOT,OTAkeys/RIOT,cladmi/RIOT,lazytech-org/RIOT,jbeyerstedt/RIOT-OTA-update,RIOT-OS/RIOT,roberthartung/RIOT,mfrey/RIOT,roberthartung/RIOT,backenklee/RIOT,OlegHahm/RIOT,A-Paul/RIOT,LudwigOrtmann/RIOT,RIOT-OS/RIOT,avmelnikoff/RIOT,immesys/RiSyn,mfrey/RIOT,BytesGalore/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,thomaseichinger/RIOT,yogo1212/RIOT,gautric/RIOT,TobiasFredersdorf/RIOT,dailab/RIOT,BytesGalore/RIOT,kbumsik/RIOT,immesys/RiSyn