cve-check: CVE_VERSION_SUFFIX to work with patched release

CVE_VERSION_SUFFIX in "patch" to treat version string with suffix "pX"
or "patchX" as patched release.

also update testcases to cover this changes and set CVE_VERSION_SUFFIX
for sudo.

Signed-off-by: Lee Chee Yang <chee.yang.lee@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 8076815f)
Signed-off-by: Steve Sakoman <steve@sakoman.com>