Replace isc_safe routines with their OpenSSL counter parts
(cherry picked from commit 66ba2fdad583d962a1f4971c85d58381f0849e4d)
Remove isc_safe_memcompare, it's not needed anywhere and can't be replaced with CRYPTO_memcmp()
(cherry picked from commit b105ccee68ccc3c18e6ea530063b3c8e5a42571c)
Fix the isc_safe_memwipe() usage with (NULL, >0)
(cherry picked from commit 083461d3329ff6f2410745848a926090586a9846)
Resolves: rhbz#1624100
