Use .cnf for config files, not .conf

CLA: trivial

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/12592)

test/recipes/03-test_fipsinstall.t

@@ -203,7 +203,7 @@ SKIP: {
     skip "Skipping KAS DH corruption test because of no dh in this build", 1
         if disabled("dh");
 
-    ok(!run(app(['openssl', 'fipsinstall', '-out', 'fips.conf', '-module', $infile,
+    ok(!run(app(['openssl', 'fipsinstall', '-out', 'fips.cnf', '-module', $infile,
                 '-provider_name', 'fips', '-mac_name', 'HMAC',
                 '-macopt', 'digest:SHA256', '-macopt', "hexkey:$fipskey",
                 '-section_name', 'fips_sect',
@@ -216,7 +216,7 @@ SKIP: {
 SKIP: {
     skip "Skipping Signature DSA corruption test because of no dsa in this build", 1
         if disabled("dsa");
-    ok(!run(app(['openssl', 'fipsinstall', '-out', 'fips.conf', '-module', $infile,
+    ok(!run(app(['openssl', 'fipsinstall', '-out', 'fips.cnf', '-module', $infile,
                 '-provider_name', 'fips', '-mac_name', 'HMAC',
                 '-macopt', 'digest:SHA256', '-macopt', "hexkey:$fipskey",
                 '-section_name', 'fips_sect',