test/compress: add initial unit tests

test/compress: add initial unit tests

This commit introduces the initial tests for compressdev,
performing basic compression and decompression operations
of sample test buffers, using the Zlib library in one direction
and compressdev in another direction, to make sure that
the library is compatible with Zlib.

Due to the use of Zlib API, the test is disabled by default,
to avoid adding a new dependency on DPDK.

Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
Signed-off-by: Ashish Gupta <ashish.gupta@caviumnetworks.com>
Signed-off-by: Shally Verma <shally.verma@caviumnetworks.com>
Acked-by: Fiona Trahe <fiona.trahe@intel.com>
Acked-by: Lee Daly <lee.daly@intel.com>