connect network during boot (#66)

- updated configuration for boot-iso in templates.fif.json. NOTE: If you 
provide GRUB="value" during POST you must include "ip=dhcp" along with 
your custom GRUB settings.
- short circuit _anaconda_network_enable.pm to check for connection at 
start of test.
- provide needle to detect connected network interface using Network 
Spoke icon instead of Installation Source text.

NOTE: While not required with minimal-iso or dvd-iso flavors specifying 
GRUB="ip=dhcp" will also connect the network interface at boot and 
bypass _anaconda_network_enable.

needles/anaconda/network/rocky-anaconda_network_connected-20211121.json

@@ -0,0 +1,16 @@
+{
+  "area": [
+    {
+      "height": 38,
+      "type": "match",
+      "width": 42,
+      "xpos": 719,
+      "ypos": 339
+    }
+  ],
+  "properties": [],
+  "tags": [
+    "ENV-DISTRI-rocky",
+    "anaconda_network_connected"
+  ]
+}

templates.fif.json

@@ -55,6 +55,7 @@
             "distri": "rocky",
             "flavor": "boot-iso",
             "settings": {
+                "GRUB": "ip=dhcp",
                 "+QEMURAM": 3072,
                 "TEST_TARGET": "ISO"
             },
@@ -65,6 +66,7 @@
             "distri": "rocky",
             "flavor": "boot-iso",
             "settings": {
+                "GRUB": "ip=dhcp",
                 "+QEMURAM": 3072,
                 "TEST_TARGET": "ISO"
             },

tests/_anaconda_network_enable.pm

@@ -9,6 +9,11 @@ sub run {
     # Anaconda hub
     assert_screen "anaconda_main_hub", 300; #
 
+    if (check_screen ["anaconda_network_connected"], 60) {
+        # network is connected already, we're done
+        return;
+    }
+
     assert_and_click "anaconda_main_hub_network_host_name_not_connected";
     assert_and_click "anaconda_network_connect";