base: generate a stronger passwords in Person_generatePassword

- use system random
- generate longer password with a larger space

API change in an incompatible way, it's no longer possible to control
the number of alpha and numeric. This was reducing a lot the number of
combinations, so it's better to break so that callers stop generating
too weak passwords.

bt5/erp5_base/SkinTemplateItem/portal_skins/erp5_base/Person_generatePassword.py

-"""
-  This script generates a human readable random
-  password in the form 'word'+digits+'word'.
-  
-  from http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/410076
-
-  parameters: number of 'characters' , number of 'digits'
-  Pradeep Kishore Gowda <pradeep at btbytes.com >
-  License : GPL 
-  Date : 2005.April.15
-  Revision 1.2 
-  ChangeLog: 
-  1.1 - fixed typos 
-  1.2 - renamed functions _apart & _npart to a_part & n_part as zope does not allow functions to 
-  start with _
-"""
-
-import string, random
-vowels = ['a','e','i','o','u']
-consonants = [a for a in string.ascii_lowercase if a not in vowels]
-digits = string.digits
-
-def a_part(slen):
-    ret = ''
-    for i in range(slen):			
-        if i%2 ==0:
-            randid = random.randint(0,20) #number of consonants
-            ret += consonants[randid]
-        else:
-            randid = random.randint(0,4) #number of vowels
-            ret += vowels[randid]
-    return ret
-
-def n_part(slen):
-    ret = ''
-    for i in range(slen):
-        randid = random.randint(0,9) #number of digits
-        ret += digits[randid]
-    return ret
-
-fpl = alpha/2		
-if alpha % 2 :
-    fpl = int(alpha/2) + 1 					
-lpl = alpha - fpl	
-
-start = a_part(fpl)
-mid = n_part(numeric)
-end = a_part(lpl)
-newpass = "%s%s%s" % (start,mid,end)
-return newpass
+return ''.join(random.SystemRandom().sample(string.letters + string.digits, length))

bt5/erp5_base/SkinTemplateItem/portal_skins/erp5_base/Person_generatePassword.xml

@@ -50,7 +50,7 @@
         </item>
         <item>
             <key> <string>_params</string> </key>
-            <value> <string>alpha=6, numeric=2</string> </value>
+            <value> <string>length=20</string> </value>
         </item>
         <item>
             <key> <string>id</string> </key>
@@ -58,7 +58,7 @@
         </item>
         <item>
             <key> <string>title</string> </key>
-            <value> <string>Generate human readable random password</string> </value>
+            <value> <string></string> </value>
         </item>
       </dictionary>
     </pickle>