[Click] Bug in ip6encap + patch

[Erwin Van de Velde]

Dear all,

I have found a bug in the ip6encap element. The element sets the IP version 
and flags first and then the flow label, which is only 20 bits, but stored in 
a uint32_t. In this order the IP version and flags are overwritten, so I 
reordered them, as is found in other elements. Please find attached a patch 
against the latest git version of ip6encap.cc .

Best regards,
Erwin
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