Move add_oid_section to apps.c, so it can be shared by several
applications.  Also, have it and the certificate and key loading
functions take a BIO argument for error output.

apps/apps.h

diff --git a/apps/apps.h b/apps/apps.h
index 7885688..6b89b79 100644
--- a/apps/apps.h
+++ b/apps/apps.h
@@ -65,6 +65,7 @@
 #include <openssl/bio.h>
 #include <openssl/crypto.h>
 #include <openssl/x509.h>
+#include <openssl/lhash.h>
 
 int app_RAND_load_file(const char *file, BIO *bio_e, int dont_warn);
 int app_RAND_write_file(const char *file, BIO *bio_e);
@@ -146,9 +147,10 @@
 int dump_cert_text(BIO *out, X509 *x);
 #endif
 int app_passwd(BIO *err, char *arg1, char *arg2, char **pass1, char **pass2);
-X509 *load_cert(char *file, int format);
-EVP_PKEY *load_key(char *file, int format, char *pass);
-STACK_OF(X509) *load_certs(char *file, int format);
+int add_oid_section(BIO *err, LHASH *conf);
+X509 *load_cert(BIO *err, char *file, int format);
+EVP_PKEY *load_key(BIO *err, char *file, int format, char *pass);
+STACK_OF(X509) *load_certs(BIO *err, char *file, int format);
 
 #define FORMAT_UNDEF    0
 #define FORMAT_ASN1     1