CASTOR-5104 RFE: Improve the const correctness of Cns_enterclass()

Fixed.

h/Cns_api.h

@@ -252,7 +252,7 @@ EXTERN_C int Cns_delsegbycopyno (const char *, struct Cns_fileid *, int);
 EXTERN_C int Cns_du (const char *, int, u_signed64 *, u_signed64 *);
 EXTERN_C int Cns_endsess ();
 EXTERN_C int Cns_endtrans ();
-EXTERN_C int Cns_enterclass (char *, struct Cns_fileclass *);
+EXTERN_C int Cns_enterclass (const char *, const struct Cns_fileclass *);
 EXTERN_C int Cns_errmsg (char *, char *, ...);
 EXTERN_C int Cns_getacl (const char *, int, struct Cns_acl *);
 EXTERN_C int Cns_getcomment (const char *, char *);

ns/Cns_enterclass.c

@@ -16,7 +16,7 @@
 #include "serrno.h"
 
 int
-Cns_enterclass(char *server, struct Cns_fileclass *Cns_fileclass)
+Cns_enterclass(const char *server, const struct Cns_fileclass *Cns_fileclass)
 {
   int c;
   char func[16];

ns/Cns_enterclass.man

@@ -9,8 +9,8 @@ Cns_enterclass \- define a new fileclass in the name server
 .br
 \fB#include "Cns_api.h"\fR
 .sp
-.BI "int Cns_enterclass (char *" server ,
-.BI "struct Cns_fileclass *" Cns_fileclass )
+.BI "int Cns_enterclass (const char *" server ,
+.BI "const struct Cns_fileclass *" Cns_fileclass )
 .SH DESCRIPTION
 .B Cns_enterclass
 defines a new fileclass in the name server.