Extensive reorganisation of PRNG handling in FIPS module: all calls

now use an internal RAND_METHOD. All dependencies to OpenSSL standard
PRNG are now removed: it is the applications resposibility to setup
the FIPS PRNG and initalise it.

Initial OpenSSL RAND_init_fips() function that will setup the DRBG
for the "FIPS capable OpenSSL".

crypto/rand/rand_err.c

@@ -74,6 +74,7 @@ static ERR_STRING_DATA RAND_str_functs[]=
 {ERR_FUNC(RAND_F_FIPS_RAND_SET_DT),	"FIPS_RAND_SET_DT"},
 {ERR_FUNC(RAND_F_FIPS_SET_PRNG_SEED),	"FIPS_SET_PRNG_SEED"},
 {ERR_FUNC(RAND_F_FIPS_SET_TEST_MODE),	"FIPS_SET_TEST_MODE"},
+{ERR_FUNC(RAND_F_FIPS_X931_SET_DT),	"FIPS_x931_set_dt"},
 {ERR_FUNC(RAND_F_RAND_GET_RAND_METHOD),	"RAND_get_rand_method"},
 {ERR_FUNC(RAND_F_SSLEAY_RAND_BYTES),	"SSLEAY_RAND_BYTES"},
 {0,NULL}