Use SFTP flags for reading

Changelog.rst

@@ -14,6 +14,7 @@ Fixes
 --------
 
 * ``ParallelSSH2Client.join`` timeout duration was incorrectly for per-host rather than total.
+* SFTP read flags were not fully portable.
 
 1.3.2
 ++++++

pssh/ssh2_client.py

@@ -31,7 +31,7 @@
 from ssh2.exceptions import AuthenticationError, AgentError, \
     SessionHandshakeError, SFTPHandleError, SFTPIOError as SFTPIOError_ssh2
 from ssh2.session import Session
-from ssh2.sftp import LIBSSH2_FXF_CREAT, LIBSSH2_FXF_WRITE, \
+from ssh2.sftp import LIBSSH2_FXF_READ, LIBSSH2_FXF_CREAT, LIBSSH2_FXF_WRITE, \
     LIBSSH2_FXF_TRUNC, LIBSSH2_SFTP_S_IRUSR, LIBSSH2_SFTP_S_IRGRP, \
     LIBSSH2_SFTP_S_IWUSR, LIBSSH2_SFTP_S_IXUSR, LIBSSH2_SFTP_S_IROTH, \
     LIBSSH2_SFTP_S_IXGRP, LIBSSH2_SFTP_S_IXOTH
@@ -587,7 +587,9 @@ def _sftp_get(self, remote_fh, local_file):
                 local_fh.write(data)
 
     def sftp_get(self, sftp, remote_file, local_file):
-        with self._sftp_openfh(sftp.open, remote_file, 0, 0) as remote_fh:
+        with self._sftp_openfh(
+                sftp.open, remote_file,
+                LIBSSH2_FXF_READ, LIBSSH2_SFTP_S_IRUSR) as remote_fh:
             try:
                 self._sftp_get(remote_fh, local_file)
                 # THREAD_POOL.apply(