debian: Set KERNELRELEASE environment variable to fix compilation of binary version.
fixup! Changed method of free kZorp related data in conntrack.
tests: Fixed several problems of the kernel module tests.
build: Disable the kernel modules compilation by default.

It makes possible to run the same tests on this module in the continues
integration systems just like in case of any other module independently
from the installed kernel version on the system.

Debian packaging calls make directly in the driver directory.
tests: Moved kernel module test to under the source directory.

It disables the run of the kernel module test in case of make check as they
are not unit tests an they are in need of the loaded kernel module. They can
be run by make driver-check.
kzorp: Added execute right to the Python unit tests.
socket_kzorp: Initial commit of xt_socket.* files.

Coes from kernel version 3.16.
socket_kzorp: Customized the original socket match code.

 * added _kzorp postfix to the filenames
 * inserted _KZORP to the header guard
 * added _kzorp postfix to the module name
socket_kzorp: Implemented socket mark based matching.
socket_kzorp: Permitted socket match on output chain.
socket_kzorp: Customized the socket mark based matching code.
Fixed compilation on kernel version 3.10.
kzorp: Make option handling optional in the Adapter class.
Initial commit of Travis configuration
travis: debug messages