conntrack: fix nfct_clone with certain attribute data types

some attributes are pointers to malloc'd objects.  Simply copying the
pointer results in use-after free when the original or the clone is
destroyed.

Fix it by using nfct_copy instead of memcpy and add proper test case
for cloned objects:
- nfct_cmp of orig and clone should return 1 (equal)
- freeing both the original and the clone should
  neither leak memory nor result in double-frees.

the testsuite changes revealed a few more problems:
 - ct1->timeout == ct2->timeout returned 0, ie. same timeout
   was considered "not equal" by nfct_cmp
 - secctx comparision causes "Invalid address" valgrind warnings
   when pointer is NULL
 - NFCT_CP_OVERRIDE did not handle helper attribute and
   erronously freed ct1 secctx memory.

While at it, bump qa_test data dummy to 256 (else, valgrind
complains about move-depends-on-uninitialized-memory).

Lastly, fix compilation of test_api by killing bogus ATTR_CONNLABEL.

Signed-off-by: Florian Westphal <fw@strlen.de>

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