utils: add get_kwargs_from_env function

onedns/utils.py

@@ -1,10 +1,21 @@
+import os
+
 from onedns.logger import log
 
 
-def get_kwargs_from_dict(d, prefix):
-    kwargs = dict((i.replace(prefix, ''), d[i])
-                  for i in d.keys() if i.startswith(prefix))
-    return kwargs
+def get_kwargs_from_dict(d, prefix, lower=False):
+    tups_list = []
+    for i in d:
+        if i.startswith(prefix):
+            arg = i.replace(prefix, '')
+            if lower:
+                arg = arg.lower()
+            tups_list.append((arg, d[i]))
+    return dict(tups_list)
+
+
+def get_kwargs_from_env(prefix, lower=False):
+    return get_kwargs_from_dict(os.environ, prefix, lower=lower)
 
 
 def shell(local_ns={}):