bugfix for ios_config module

This commit address a bug in the ios_config module when using the
match: strict argument.  When the argument is used, the module will
compare the configuration block same as match: exact which is not the
intended behavior.  This commit updates the behavior to propertly handle
the strict argument.

network/ios/ios_config.py

@@ -166,15 +166,12 @@ def build_candidate(lines, parents, config, strategy):
     candidate = list()
 
     if strategy == 'strict':
-        if len(lines) != len(config):
+        for index, cmd in enumerate(lines):
-            candidate = list(lines)
+            try:
-        else:
+                if cmd != config[index]:
-            for index, cmd in enumerate(lines):
-                try:
-                    if cmd != config[index]:
-                        candidate.append(cmd)
-                except IndexError:
                     candidate.append(cmd)
+            except IndexError:
+                candidate.append(cmd)
 
     elif strategy == 'exact':
         if len(lines) != len(config):