Fix missing TYPE argument and value in ifcfg files

Handle cases where TYPE is present but empty, as well as when TYPE is missing entirely from the ifcfg file.
Also including the case sensitive coverage and preventing any dict unexpected behaviors.

coriolis/osmorphing/netpreserver/ifcfg.py

@@ -52,6 +52,10 @@ class IfcfgNetPreserver(base.BaseNetPreserver):
         ifcfgs = []
         for ifcfg_file in self._get_net_config_files(network_scripts_path):
             ifcfg = self.osmorphing_tool._read_config_file_sudo(ifcfg_file)
-            if ifcfg.get("TYPE") == ifcfg_type:
+            detected_type = ifcfg.get('TYPE')
+            if not detected_type:
+                detected_type = "Ethernet"
+                ifcfg["TYPE"] = detected_type
+            if detected_type.lower() == ifcfg_type.lower():
                 ifcfgs.append((ifcfg_file, ifcfg))
         return ifcfgs