bugzilla, use SSLProtocol ALL -SSLv2

instead of disabling ALL and enabling
SSLv3 and TLSv1,
enable ALL and disable SSLv2

-       SSLProtocol -ALL +SSLv3 +TLSv1
+       SSLProtocol ALL -SSLv2

because we want to allow newer ciphers
and Mozilla recommends it

but is it really better to exclude
things instead of including them

Change-Id: Ibfcc19a32016ff3a74b73ae633d31cdc18a4ba30