cifs: dump Security Type info in DebugData

Currently the end user is unaware with what sec type the
cifs share is mounted if no sec=<type> option is parsed.
With this patch one can easily check from DebugData.

Example:
1) Name: x.x.x.x Uses: 1 Capability: 0x8001f3fc	Session Status: 1 Security type: RawNTLMSSP
Signed-off-by: Kenneth D'souza <kdsouza@redhat.com>
Signed-off-by: Roberto Bergantinos Corpas <rbergant@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Acked-by: Aurelien Aptel <aaptel@suse.com>

fs/cifs/cifs_debug.c

@@ -221,6 +221,8 @@ static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
 	struct cifs_ses *ses;
 	struct cifs_tcon *tcon;
 	int i, j;
+	const char *security_types[] = {"Unspecified", "LANMAN", "NTLM",
+                                       "NTLMv2", "RawNTLMSSP", "Kerberos"};
 
 	seq_puts(m,
 		    "Display Internal CIFS Data Structures for Debugging\n"
@@ -375,6 +377,10 @@ static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
 				ses->ses_count, ses->serverOS, ses->serverNOS,
 				ses->capabilities, ses->status);
 			}
+
+			seq_printf(m,"Security type: %s\n",
+                                      security_types[server->ops->select_sectype(server, ses->sectype)]);
+
 			if (server->rdma)
 				seq_printf(m, "RDMA\n\t");
 			seq_printf(m, "TCP status: %d Instance: %d\n\tLocal Users To "