Remove dependency on six.

We no longer support Python 2, so remove the compatibility shim.

iocage_lib/utils.py

@@ -1,5 +1,3 @@
-import six
-
 from ctypes import CDLL
 from ctypes.util import find_library
 
@@ -20,6 +18,6 @@ def load_ctypes_library(name, signatures):
 
 
 def ensure_unicode_str(value):
-    if not isinstance(value, six.text_type):
+    if not isinstance(value, str):
         value = value.decode()
     return value

requirements.txt

@@ -5,5 +5,4 @@ coloredlogs>=9.0
 netifaces>=0.10.8
 GitPython>=2.1.11
 dnspython>=1.15.0
-six>=1.15.0
 jsonschema>=3.2.0

setup.py

@@ -57,7 +57,6 @@
         'GitPython>=2.1.11',
         'netifaces>=0.10.8',
         'dnspython>=1.15.0',
-        'six>=1.15.0',
         'jsonschema>=3.2.0'
     ],
     entry_points={'console_scripts': ['iocage = iocage_lib:cli']},