tools: Not detecting the type of python files. Assuming python3.

- Also now not using any tools that depend on python2.
- Simplifies installation.
- Personally not using python2.
- Eris is not used widely enough to justify supporting python2 files.
- The way of determining whether a source file was python2 or python3 was
  not very good.

tests/golden-files/input/hi.py

@@ -1,4 +0,0 @@
-
-
-def hi():
-    print "hi"

tests/golden-files/results/bandit-hi_py

@@ -1,19 +0,0 @@
-Test results:                      
-    No issues identified.          
-                                   
-Code scanned:                      
-    Total lines of code: 2         
-    Total lines skipped (#nosec): 0
-                                   
-Run metrics:                       
-    Total issues (by severity):    
-        Undefined: 0               
-        Low: 0                     
-        Medium: 0                  
-        High: 0                    
-    Total issues (by confidence):  
-        Undefined: 0               
-        Low: 0                     
-        Medium: 0                  
-        High: 0                    
-Files skipped (0):                 

tests/golden-files/results/mypy-hi_py

@@ -1 +0,0 @@
-input/hi.py:4: error: Missing parentheses in call to 'print'. Did you mean print("hi")?

tests/golden-files/results/pydoc-hi_py

@@ -1,12 +0,0 @@
-Help on module hi:
-                  
-NAME              
-    hi            
-                  
-FILE              
-    input/hi.py   
-                  
-FUNCTIONS         
-    hi()          
-                  
-                  

tests/golden-files/results/pylint-hi_py

@@ -1 +0,0 @@
-No config file found, using default configuration

tests/golden-files/results/python_coverage-hi_py

@@ -1,4 +0,0 @@
-(B                
-                
-(B> def hi():(B     
-(B>     print "hi"(B

tests/golden-files/results/python_gut-hi_py

@@ -1 +0,0 @@
-(Bdef(B (Bhi(B():(B

tests/golden-files/results/python_mccabe-hi_py

@@ -1 +0,0 @@
-("3:0: 'hi'", 1)

tests/golden-files/results/python_modulefinder-hi_py

@@ -1,4 +0,0 @@
-                                         
-  Name                      File         
-  ----                      ----         
-m __main__                  ./input/hi.py

tests/golden-files/results/python_unittests-hi_py

@@ -1 +0,0 @@
-No tests.

tests/tools_test.py

@@ -81,7 +81,7 @@ class ToolsTestCase(unittest.TestCase):
     def test_contents(self):
         self._test_tool(tools.contents, [("hi3.py", tools.Status.normal)])
 
-    HI_OK = [("hi3.py", tools.Status.ok), ("hi.py", tools.Status.ok)]
+    HI_OK = [("hi3.py", tools.Status.ok)]
 
     def test_python_syntax(self):
         self._test_tool(tools.python_syntax, self.HI_OK)
@@ -94,8 +94,7 @@ class ToolsTestCase(unittest.TestCase):
     #                      ("hi3_test.py", tools.Status.ok),
     #                      ("test_foo.py", tools.Status.ok)])
 
-    HI_NORMAL = [("hi3.py", tools.Status.normal),
-                 ("hi.py", tools.Status.normal)]
+    HI_NORMAL = [("hi3.py", tools.Status.normal)]
 
     def test_pydoc(self):
         # FIX: This is failing inside AppImages.
@@ -103,8 +102,7 @@ class ToolsTestCase(unittest.TestCase):
             self._test_tool(tools.pydoc, self.HI_NORMAL)
 
     def test_mypy(self):
-        self._test_tool(tools.mypy, [("hi3.py", tools.Status.ok),
-                                     ("hi.py", tools.Status.problem)])
+        self._test_tool(tools.mypy, self.HI_OK)
 
     def test_python_coverage(self):
         self._test_tool(tools.python_coverage, self.HI_NORMAL)
@@ -128,8 +126,7 @@ class ToolsTestCase(unittest.TestCase):
         self._test_tool(tools.python_mccabe, self.HI_OK)
 
     def test_bandit(self):
-        self._test_tool(tools.bandit, [("hi3.py", tools.Status.ok),
-                                       ("hi.py", tools.Status.ok)])
+        self._test_tool(tools.bandit, self.HI_OK)
 
     # FIX: Make the golden-file deterministic
     # def test_pydisasm(self):