Fix possible infinite loop in IPv6 hop-by-hop header parsing
Fix possible infinite loop in IPv6 hop-by-hop header parsing

Unknown hop-by-hop options are currently not processed, which triggers an
infinite loop due to the pointer not advancing further in the header.

Change-Id: Idf9176090e042b17aac1baa25a6cb4beb8c199d8
Signed-off-by: Yoann Desmouceaux <3d2a91419ec85d2544c543fe75d33c8b8dcc5f8e@cisco.com>

chrisy/vpp,GabrielGanne/vpp-flowtable,FDio/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,GabrielGanne/vpp-flowtable,muharif/vpp,muharif/vpp,vpp-dev/vpp,muharif/vpp,chrisy/vpp,vpp-dev/vpp,milanlenco/vpp,chrisy/vpp,GabrielGanne/vpp-flowtable,milanlenco/vpp,milanlenco/vpp,vpp-dev/vpp,milanlenco/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,GabrielGanne/vpp-flowtable,chrisy/vpp,vpp-dev/vpp,FDio/vpp,muharif/vpp,GabrielGanne/vpp-flowtable,muharif/vpp,milanlenco/vpp,vpp-dev/vpp,muharif/vpp,FDio/vpp,milanlenco/vpp,vpp-dev/vpp,chrisy/vpp,vpp-dev/vpp,GabrielGanne/vpp-flowtable,chrisy/vpp