Add documentation for the -sigopt option.

Reviewed-by: Paul Yang <yang.yang@baishancloud.com>
(Merged from openssl#8520)

doc/man1/ca.pod

@@ -51,6 +51,7 @@ B<openssl> B<ca>
 [B<-engine id>]
 [B<-subj arg>]
 [B<-utf8>]
+[B<-sigopt nm:v>]
 [B<-create_serial>]
 [B<-rand_serial>]
 [B<-multivalue-rdn>]
@@ -134,6 +135,11 @@ The private key to sign requests with.
 The format of the data in the private key file.
 The default is PEM.
 
+=item B<-sigopt nm:v>
+
+Pass options to the signature algorithm during sign or verify operations.
+Names and values of these options are algorithm-specific.
+
 =item B<-key password>
 
 The password used to encrypt the private key. Since on some
@@ -753,7 +759,7 @@ L<config(5)>, L<x509v3_config(5)>
 
 =head1 COPYRIGHT
 
-Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
+Copyright 2000-2019 The OpenSSL Project Authors. All Rights Reserved.
 
 Licensed under the Apache License 2.0 (the "License").  You may not use
 this file except in compliance with the License.  You can obtain a copy

doc/man1/dgst.pod

@@ -22,6 +22,7 @@ B<openssl dgst>
 [B<-verify filename>]
 [B<-prverify filename>]
 [B<-signature filename>]
+[B<-sigopt nm:v>]
 [B<-hmac key>]
 [B<-fips-fingerprint>]
 [B<-rand file...>]
@@ -235,7 +236,7 @@ The FIPS-related options were removed in OpenSSL 1.1.0.
 
 =head1 COPYRIGHT
 
-Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
+Copyright 2000-2019 The OpenSSL Project Authors. All Rights Reserved.
 
 Licensed under the Apache License 2.0 (the "License").  You may not use
 this file except in compliance with the License.  You can obtain a copy

doc/man1/req.pod

@@ -46,6 +46,7 @@ B<openssl> B<req>
 [B<-reqopt>]
 [B<-subject>]
 [B<-subj arg>]
+[B<-sigopt nm:v>]
 [B<-batch>]
 [B<-verbose>]
 [B<-engine id>]
@@ -82,6 +83,11 @@ This specifies the input filename to read a request from or standard input
 if this option is not specified. A request is only read if the creation
 options (B<-new> and B<-newkey>) are not specified.
 
+=item B<-sigopt nm:v>
+
+Pass options to the signature algorithm during sign or verify operations.
+Names and values of these options are algorithm-specific.
+
 =item B<-passin arg>
 
 The input file password source. For more information about the format of B<arg>
@@ -689,7 +695,7 @@ L<x509v3_config(5)>
 
 =head1 COPYRIGHT
 
-Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
+Copyright 2000-2019 The OpenSSL Project Authors. All Rights Reserved.
 
 Licensed under the Apache License 2.0 (the "License").  You may not use
 this file except in compliance with the License.  You can obtain a copy

doc/man1/x509.pod

@@ -63,6 +63,7 @@ B<openssl> B<x509>
 [B<-clrext>]
 [B<-extfile filename>]
 [B<-extensions section>]
+[B<-sigopt nm:v>]
 [B<-rand file...>]
 [B<-writerand file>]
 [B<-engine id>]
@@ -364,6 +365,11 @@ and the end date to a value determined by the B<-days> option.
 It retains any certificate extensions unless the B<-clrext> option is supplied;
 this includes, for example, any existing key identifier extensions.
 
+=item B<-sigopt nm:v>
+
+Pass options to the signature algorithm during sign or verify operations.
+Names and values of these options are algorithm-specific.
+
 =item B<-passin arg>
 
 The key password source. For more information about the format of B<arg>
@@ -948,7 +954,7 @@ the old form must have their links rebuilt using B<c_rehash> or similar.
 
 =head1 COPYRIGHT
 
-Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
+Copyright 2000-2019 The OpenSSL Project Authors. All Rights Reserved.
 
 Licensed under the Apache License 2.0 (the "License").  You may not use
 this file except in compliance with the License.  You can obtain a copy