Add '.' support for glusterfs volume names, and provide additional error notification.

gistfile1.py

diff --git a/cli/src/cli-cmd-parser.c b/cli/src/cli-cmd-parser.c
index c09aa62..7e55757 100644
--- a/cli/src/cli-cmd-parser.c
+++ b/cli/src/cli-cmd-parser.c
@@ -211,7 +211,9 @@ cli_cmd_volume_create_parse (const char **words, int wordcount, dict_t **options
                         goto out;
 
                 for (i = 0; i < strlen (volname); i++)
-                        if (!isalnum (volname[i]) && (volname[i] != '_') && (volname[i] != '-'))
+                        if (!isalnum (volname[i]) && (volname[i] != '_') && (volname[i] != '-') && (volname[i] != '.')) {
+                                cli_err ("\"%s\" contains one or more invalid characters.",
+                                         volname);
                                 goto out;
                 }
         }