Revert "core.packet: make packet_t public accoding to documentation."
Revert "core.packet: make packet_t public accoding to documentation."

This reverts commit 0214574d6afe03639b47035b2c2919f82a36f001.

wingo/snabbswitch,heryii/snabb,heryii/snabb,alexandergall/snabbswitch,snabbco/snabb,dpino/snabb,Igalia/snabb,dpino/snabbswitch,Igalia/snabbswitch,Igalia/snabb,alexandergall/snabbswitch,alexandergall/snabbswitch,heryii/snabb,eugeneia/snabb,SnabbCo/snabbswitch,eugeneia/snabbswitch,wingo/snabb,Igalia/snabb,alexandergall/snabbswitch,alexandergall/snabbswitch,wingo/snabb,Igalia/snabb,dpino/snabbswitch,eugeneia/snabb,snabbco/snabb,heryii/snabb,dpino/snabbswitch,Igalia/snabbswitch,Igalia/snabb,eugeneia/snabb,snabbco/snabb,dpino/snabb,eugeneia/snabb,Igalia/snabbswitch,Igalia/snabbswitch,wingo/snabb,wingo/snabbswitch,dpino/snabb,alexandergall/snabbswitch,eugeneia/snabb,kbara/snabb,mixflowtech/logsensor,Igalia/snabbswitch,kbara/snabb,wingo/snabb,heryii/snabb,kbara/snabb,mixflowtech/logsensor,mixflowtech/logsensor,Igalia/snabb,mixflowtech/logsensor,eugeneia/snabbswitch,SnabbCo/snabbswitch,snabbco/snabb,mixflowtech/logsensor,dpino/snabb,Igalia/snabb,snabbco/snabb,alexandergall/snabbswitch,snabbco/snabb,heryii/snabb,wingo/snabb,snabbco/snabb,eugeneia/snabb,kbara/snabb,wingo/snabb,eugeneia/snabbswitch,dpino/snabb,SnabbCo/snabbswitch,eugeneia/snabb,SnabbCo/snabbswitch,wingo/snabbswitch,dpino/snabb,snabbco/snabb,eugeneia/snabb,dpino/snabbswitch,kbara/snabb,eugeneia/snabbswitch,kbara/snabb,alexandergall/snabbswitch,wingo/snabbswitch,dpino/snabb,Igalia/snabb