unittests: alloc Packet with PacketGetFromAlloc

unittests: alloc Packet with PacketGetFromAlloc

Some unittests used SCMalloc for allocating new Packet the unittests.
While this is valid, it leads to segmentation faults when we move to
dynamic allocation of the maximum alerts allowed to be triggered by a
single packet.

This massive patch uses PacketGetFromAlloc, which initializes a Packet
in such a way that any dynamic allocated structures within will also be
initialized.

Backport: edit a few more files/unittests that were not present in 7.0.x

Related to
Task #4207

(cherry picked from commit ccd45345811dfa4c20a5755f7506dd3e81cfdd38)