Replace use of deprecated encrypt method from passlib library

[Ryan J Ollos]

I noticed the following in the AppVeyor builds:

C:\projects\trac\trac\util\compat.py:36: DeprecationWarning: the method passlib.handlers.des_crypt.des_crypt.encrypt() is deprecated as of Passlib 1.7, and will be removed in Passlib 2.0, use .hash() instead.
  return des_crypt.encrypt(secret, salt=salt)

PasswordHash.encrypt() was renamed to PasswordHash.hash() in ​release 1.7 (Nov 2016).

[Ryan J Ollos]

Proposed changes:

trac/util/compat.py

@@ -34 +34 @@
         crypt = None
     else:
         def crypt(secret, salt):
-            return des_crypt.encrypt(secret, salt=salt)
+            # encrypt method deprecated in favor of hash in passlib 1.7
+            hash_method = des_crypt.hash if hasattr(des_crypt, 'hash') \
+                                         else des_crypt.encrypt
+            return hash_method(secret, salt=salt)
 
 # Import symbols previously defined here, kept around so that plugins importing
 # them don't suddenly stop working

Tested with Passlib 1.6 and 1.7 on Windows 7 x64.

[Ryan J Ollos]

Committed to 1.2-stable in r15400, merged to trunk in r15401.

[Ryan J Ollos]

See also #12861.

[Ryan J Ollos]

Additional documentation in 1.3/TracInstall@10.