Patch by Robert Scheck <robert@fedoraproject.org> for phpMyAdmin 4.2.6
which enhances cookie encryption/decryption by the optional usage of
PHP OpenSSL. Unfortunately PHP Mcrypt is not shipped by all Linux
distributions however PHP OpenSSL is often enabled by default.
PHP < 5.3.4 does not support passing an IV, thus this has been added as
a requirement. I could have used 'BF-CBC' rather 'AES-128-CBC' but Blowfish
(even it is fast) is seen by experts as weaker algorithm than
AES. If this should be a show-stopper for upstream merging just replace
'AES-128-CBC' by 'BF-CBC', please.

Patch adapted for 4.3.x and tests modified by Marc Delisle

Signed-off-by: Marc Delisle <marc@infomarc.info>
Merge branch 'QA_4_3' of https://github.com/phpmyadmin/phpmyadmin into QA_4_3
ChangeLog entry

Signed-off-by: Marc Delisle <marc@infomarc.info>