Fix API version comparison

docker/utils/utils.py

@@ -15,6 +15,7 @@
 import io
 import tarfile
 import tempfile
+from distutils.version import StrictVersion
 
 import requests
 import six
@@ -51,7 +52,25 @@ def tar(path):
 
 
 def compare_version(v1, v2):
-    return float(v2) - float(v1)
+    """Compare docker versions
+
+    >>> v1 = '1.9'
+    >>> v2 = '1.10'
+    >>> compare_version(v1, v2)
+    1
+    >>> compare_version(v2, v1)
+    -1
+    >>> compare_version(v2, v2)
+    0
+    """
+    s1 = StrictVersion(v1)
+    s2 = StrictVersion(v2)
+    if s1 == s2:
+        return 0
+    elif s1 > s2:
+        return -1
+    else:
+        return 1
 
 
 def ping(url):