examples BUGFIX reflect changes in modules and api

Fixed the default config in config.json, removed UNIX sock from the config and added an option to create it with API, also made some changes to the description of the examples.

Fixes #472.
diff --git a/examples/server.c b/examples/server.c
index a43a5bc..83e71c7 100644
--- a/examples/server.c
+++ b/examples/server.c
@@ -198,12 +198,11 @@
             "\n"
             "    Available options:\n"
             "    -h, --help\t     \tPrint usage help.\n"
-            "    -u, --unix\t<path>\tCreate a UNIX socket at the place specified by <path>.\n"
-            "    -s, --ssh\t<path>\tCreate a SSH server with the host SSH key located at <path>.\n\n");
+            "    -u, --unix\t<path>\tCreate a UNIX socket endpoint at the place specified by <path>.\n\n");
 }
 
 static int
-init(struct ly_ctx **context, struct nc_pollsession **ps)
+init(const char *unix_socket_path, struct ly_ctx **context, struct nc_pollsession **ps)
 {
     int rc = 0;
     struct lyd_node *config = NULL;
@@ -237,6 +236,14 @@
         ERR_MSG_CLEANUP("Error occurred while initializing the server.\n");
     }
 
+    /* create unix socket endpoint if path was set */
+    if (unix_socket_path) {
+        rc = nc_server_add_endpt_unix_socket_listen("unix-socket-endpt", unix_socket_path, -1, -1, -1);
+        if (rc) {
+            ERR_MSG_CLEANUP("Creating UNIX socket endpoint failed.\n");
+        }
+    }
+
     /* create a new poll session structure, which is used for polling RPCs sent by clients */
     *ps = nc_ps_new();
     if (!*ps) {
@@ -261,16 +268,18 @@
     struct ly_ctx *context = NULL;
     struct nc_session *session, *new_session;
     struct nc_pollsession *ps = NULL;
+    const char *unix_socket_path = NULL;
 
     struct option options[] = {
         {"help",    no_argument,        NULL, 'h'},
         {"debug",   no_argument,        NULL, 'd'},
+        {"unix",    required_argument,  NULL, 'u'},
         {NULL,      0,                  NULL,  0}
     };
 
     opterr = 0;
 
-    while ((opt = getopt_long(argc, argv, "hd", options, NULL)) != -1) {
+    while ((opt = getopt_long(argc, argv, "hdu:", options, NULL)) != -1) {
         switch (opt) {
         case 'h':
             help_print();
@@ -280,13 +289,17 @@
             nc_verbosity(NC_VERB_DEBUG);
             break;
 
+        case 'u':
+            unix_socket_path = optarg;
+            break;
+
         default:
             ERR_MSG_CLEANUP("Invalid option or missing argument\n");
         }
     }
 
     /* initialize the server */
-    r = init(&context, &ps);
+    r = init(unix_socket_path, &context, &ps);
     if (r) {
         ERR_MSG_CLEANUP("Initializing the server failed.");
     }