devlib: Replace errors when decoding output from subprocess

If an error occurs when attempting to decode the output from subprocess
replace the offending character rather than raising an error.

devlib/utils/android.py

@@ -153,7 +153,7 @@ class ApkInfo(object):
         try:
             output = subprocess.check_output(command, stderr=subprocess.STDOUT)
             if sys.version_info[0] == 3:
-                output = output.decode(sys.stdout.encoding)
+                output = output.decode(sys.stdout.encoding, 'replace')
         except subprocess.CalledProcessError as e:
             raise HostError('Error parsing APK file {}. `aapt` says:\n{}'
                             .format(apk_path, e.output))

devlib/utils/ssh.py

@@ -265,7 +265,7 @@ class SshConnection(object):
         # the regex removes line breaks potential introduced when writing
         # command to shell.
         if sys.version_info[0] == 3:
-            output = process_backspaces(self.conn.before.decode(sys.stdout.encoding))
+            output = process_backspaces(self.conn.before.decode(sys.stdout.encoding, 'replace'))
         else:
             output = process_backspaces(self.conn.before)
         output = re.sub(r'\r([^\n])', r'\1', output)

devlib/utils/version.py

@@ -10,6 +10,6 @@ def get_commit():
     if p.returncode:
         return None
     if sys.version_info[0] == 3:
-        return std[:8].decode(sys.stdout.encoding)
+        return std[:8].decode(sys.stdout.encoding, 'replace')
     else:
         return std[:8]