ENGINE module additions.

Add "init" command to control ENGINE
initialization.

Call ENGINE_finish on initialized ENGINEs on exit.

Reorder shutdown in apps.c: modules should be shut
down first.

Add test private key loader to openssl ENGINE: this
just loads a private key in PEM format.

Fix print format for dh length parameter.

apps/dhparam.c

diff --git a/apps/dhparam.c b/apps/dhparam.c
index f1664a5..ea15ef3 100644
--- a/apps/dhparam.c
+++ b/apps/dhparam.c
@@ -490,7 +490,7 @@
 		printf("\tif ((dh->p == NULL) || (dh->g == NULL))\n");
 		printf("\t\t{ DH_free(dh); return(NULL); }\n");
 		if (dh->length)
-			printf("\tdh->length = %d;\n", dh->length);
+			printf("\tdh->length = %ld;\n", dh->length);
 		printf("\treturn(dh);\n\t}\n");
 		OPENSSL_free(data);
 		}