Fix ansible-pull on python3

On python3, we can't write bytes directly to sys.stdout.

lib/ansible/utils/cmd_functions.py

@@ -24,7 +24,7 @@ import shlex
 import subprocess
 import select
 
-from ansible.compat.six import PY2
+from ansible.compat.six import PY2, PY3
 from ansible.module_utils._text import to_bytes
 
 def run_cmd(cmd, live=False, readsize=10):
@@ -51,6 +51,10 @@ def run_cmd(cmd, live=False, readsize=10):
         if p.stdout in rfd:
             dat = os.read(p.stdout.fileno(), readsize)
             if live:
+                # On python3, stdout has a codec to go from text type to bytes
+                if PY3:
+                    sys.stdout.buffer.write(dat)
+                else:
                     sys.stdout.write(dat)
             stdout += dat
             if dat == b'':
@@ -59,6 +63,10 @@ def run_cmd(cmd, live=False, readsize=10):
             dat = os.read(p.stderr.fileno(), readsize)
             stderr += dat
             if live:
+                # On python3, stdout has a codec to go from text type to bytes
+                if PY3:
+                    sys.stdout.buffer.write(dat)
+                else:
                     sys.stdout.write(dat)
             if dat == b'':
                 rpipes.remove(p.stderr)

test/utils/shippable/python3-test-target-blacklist.txt

@@ -1,3 +0,0 @@
-s/ pull_run / /
-s/ pull_no_127 / /
-s/ pull_limit_inventory / /