acloud: deprecated platform.linux_distribution.

   platform.linux_distribution is deprecated since 3.7
it is compatible to judge supported system by platform.version().

BUG: 159680296
Test: acloud-py3-dev setup
acloud-dev setup

Change-Id: I96b555e4c55448adee60a63428bb729078ef9a70
diff --git a/internal/lib/utils.py b/internal/lib/utils.py
index 3adacde..6060c88 100755
--- a/internal/lib/utils.py
+++ b/internal/lib/utils.py
@@ -1207,6 +1207,9 @@
 def IsSupportedPlatform(print_warning=False):
     """Check if user's os is the supported platform.
 
+    platform.version() return such as '#1 SMP Debian 5.6.14-1rodete2...'
+    and use to judge supported or not.
+
     Args:
         print_warning: Boolean, print the unsupported warning
                        if True.
@@ -1214,17 +1217,19 @@
         Boolean, True if user is using supported platform.
     """
     system = platform.system()
-    # TODO(b/143197659): linux_distribution() deprecated in python 3. To fix it
-    # try to use another package "import distro".
-    dist = platform.linux_distribution()[0]
-    platform_supported = (system in _SUPPORTED_SYSTEMS_AND_DISTS and
-                          dist in _SUPPORTED_SYSTEMS_AND_DISTS[system])
+    # TODO(b/161085678): After python3 fully migrated, then use distro to fix.
+    platform_supported = False
+    if system in _SUPPORTED_SYSTEMS_AND_DISTS:
+        for dist in _SUPPORTED_SYSTEMS_AND_DISTS[system]:
+            if dist in platform.version():
+                platform_supported = True
+                break
 
     logger.info("Updated supported system and dists: %s",
                 _SUPPORTED_SYSTEMS_AND_DISTS)
     platform_supported_msg = ("%s[%s] %s supported platform" %
                               (system,
-                               dist,
+                               platform.version(),
                                "is a" if platform_supported else "is not a"))
     if print_warning and not platform_supported:
         PrintColorString(platform_supported_msg, TextColors.WARNING)