Add using-constant-test (W0125)

Author: machadoit

src/main/resources/docs/description/W0125.md

@@ -0,0 +1,5 @@
+Emitted when a conditional statement (If or ternary if) uses a constant value for its test. This might not be what the user intended to do.
+
+A simple example that will be reported:
+
+    if True: pass

src/main/resources/docs/description/description.json

@@ -834,5 +834,11 @@
     "title": "Prohibit inheriting non classes",
     "description": "Do not inherit from something which is not a class.",
     "timeToFix": 5
+  },
+  {
+    "patternId": "W0125",
+    "title": "Prohibit a conditional statement with a constant value",
+    "description": "Prohibits when a conditional statement (If or ternary if) uses a constant value for its test.",
+    "timeToFix": 5
   }
 ]

src/main/resources/docs/patterns.json

@@ -706,6 +706,11 @@
       "patternId": "W1501",
       "level": "Warning",
       "category": "ErrorProne"
+    },
+    {
+      "patternId": "W0125",
+      "level": "Warning",
+      "category": "ErrorProne"
     }
   ]
 }

src/main/resources/docs/tests/W0125.py

@@ -0,0 +1,14 @@
+##Patterns: W0125
+
+print('ola')
+
+this_is_an_intentionally_long_name_to_trigger_a_line_too_long_message_from_pylint = None
+
+##Warn: W0125
+if True: pass
+
+while True:
+    break
+
+while True:
+    break # 4 space indent