perl: add sub-package perl-tests

perl: add sub-package perl-tests

In perl source code, run "make test" will run perl test cases. Put these
cases into a seprated sub-package then we can run the perl test on
target.

Add following module to nonxs_ext to install extra modules that required
by perl test cases:
CPAN/Meta CPAN/Meta/YAML Dumpvalue Env File/CheckTree HTTP/Tiny I18N/Collate
JSON/PP Perl/OSType Version/Requirements

Commands to run test:
cd /opt/perl-tests/t && ./TEST

[Yocto 3296]

(From OE-Core rev: 96fb96ddd00881947875518df832fa74faec8a45)

Signed-off-by: Kang Kai <kai.kang@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>