Alias "unicode" to "str" under Python 3

The six way of doing this is to replace all occurences of "unicode"
with "six.text_type". However, "unicode" is non-ambiguous and
(arguably) easier to read. Also, using it makes the patches smaller,
which should help with backporting.

Reviewed-By: Petr Viktorin <pviktori@redhat.com>

ipapython/dn.py

@@ -425,6 +425,9 @@ from ldap.dn import str2dn, dn2str
 from ldap import DECODING_ERROR
 import six
 
+if six.PY3:
+    unicode = str
+
 __all__ = 'AVA', 'RDN', 'DN'
 
 def _adjust_indices(start, end, length):

ipapython/dnsutil.py

@@ -23,6 +23,9 @@ import copy
 
 import six
 
+if six.PY3:
+    unicode = str
+
 
 @six.python_2_unicode_compatible
 class DNSName(dns.name.Name):

ipapython/dogtag.py

@@ -25,6 +25,7 @@ import ConfigParser
 from urllib import urlencode
 
 import nss.nss as nss
+import six
 
 from ipalib import api, errors
 from ipalib.errors import NetworkError
@@ -33,6 +34,9 @@ from ipapython import nsslib, ipautil
 from ipaplatform.paths import paths
 from ipapython.ipa_log_manager import *
 
+if six.PY3:
+    unicode = str
+
 # IPA can use either Dogtag version 9 or 10.
 #
 # Install tools should use the constants from install_constants, so that they

ipapython/ipaldap.py

@@ -47,6 +47,9 @@ from ipapython.ipa_log_manager import log_mgr
 from ipapython.dn import DN, RDN
 from ipapython.dnsutil import DNSName
 
+if six.PY3:
+    unicode = str
+
 # Global variable to define SASL auth
 SASL_GSSAPI = ldap.sasl.sasl({}, 'GSSAPI')
 

ipapython/ssh.py

@@ -28,6 +28,11 @@ import struct
 from hashlib import md5, sha1
 from hashlib import sha256  #pylint: disable=E0611
 
+import six
+
+if six.PY3:
+    unicode = str
+
 __all__ = ['SSHPublicKey']
 
 OPENSSH_BASE_REGEX = re.compile(r'^[\t ]*(?P<keytype>[^\x00\n\r]+?) [\t ]*(?P<key>[^\x00\n\r]+?)(?:[\t ]+(?P<comment>[^\x00\n\r]*?)[\t ]*)?$')

ipapython/sysrestore.py

@@ -31,10 +31,15 @@ import ConfigParser
 import random
 import string
 
+import six
+
 from ipapython import ipautil
 from ipaplatform.tasks import tasks
 from ipaplatform.paths import paths
 
+if six.PY3:
+    unicode = str
+
 SYSRESTORE_PATH = paths.TMP
 SYSRESTORE_INDEXFILE = "sysrestore.index"
 SYSRESTORE_STATEFILE = "sysrestore.state"