CASTOR-5103 RFE: Improve the const correctness of Cns_modifyclass()

Fixed.

h/Cns_api.h

@@ -269,7 +269,7 @@ EXTERN_C int Cns_lastfseq (const char *, int, struct Cns_segattrs *);
 EXTERN_C int Cns_bulkexist (const char *, u_signed64 *, int *);
 EXTERN_C int Cns_mkdir (const char *, mode_t);
 EXTERN_C int Cns_mkdirg (const char *, const char *, mode_t);
-EXTERN_C int Cns_modifyclass (char *, int, char *, struct Cns_fileclass *);
+EXTERN_C int Cns_modifyclass (const char *, int, const char *, const struct Cns_fileclass *);
 EXTERN_C int Cns_openx (const uid_t, const gid_t, const char *, const int, const mode_t, const int, struct Cns_fileid *, struct Cns_filestatcs *, u_signed64 *);
 EXTERN_C Cns_DIR *Cns_opendir (const char *);
 EXTERN_C Cns_DIR *Cns_opendirg (const char *, const char *);

ns/Cns_modifyclass.c

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

ns/Cns_modifyclass.man

@@ -9,10 +9,10 @@ Cns_modifyclass \- modify an existing fileclass definition in the name server
 .br
 \fB#include "Cns_api.h"\fR
 .sp
-.BI "int Cns_modifyclass (char *" server ,
+.BI "int Cns_modifyclass (const char *" server ,
 .BI "int " classid ,
-.BI "char *" class_name ,
-.BI "struct Cns_fileclass *" Cns_fileclass )
+.BI "const char *" class_name ,
+.BI "const struct Cns_fileclass *" Cns_fileclass )
 .SH DESCRIPTION
 .B Cns_modifyclass
 modifies an existing fileclass definition in the name server.