rpm: make --nosignature work

OE-core uses rpm's --nosignature, but it never worked:
self._invoke_smart('config --set rpm-check-signatures=false')

Now fix it with:
* Define SUPPORT_NOSIGNATURES to 1 in system.h
* !QVA_ISSET(qva->qva_flags, SIGNATURE) -> QVA_ISSET(qva->qva_flags, SIGNATURE),
  otherwise, when use --nosignature would read database and verify
  signature, this is not expected.

This can fix some race issues, for example, when more than one process
are querying rpm file with "rpm -qp --nosignature", they may hang up
because of race issues (the processes are trying to get RW/RD lock on
the database, but they shouldn't read the database at all since -qp and
--nosignature are used).

(From OE-Core rev: 038c09d6ab9581030efdc16aa1b96972970eeaab)

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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