Description of problem:
Account provider: cannot delete user after his modification

Version-Release number of selected component (if applicable):
openlmi-0.4.1-1.el7.noarch
openlmi-tools-0.9-3.el7.noarch
libuser-0.60-3.el7.x86_64


How reproducible:
always

Steps to Reproduce:

1, create user
2, modify user
3, delete user
-------
import unittest

import lmi.shell as lmishell
import os
import shutil
import threading
import string
import random
import time

from methods import *

HOST =      "localhost"
USER =      os.environ.get("LMI_CIMOM_USERNAME", "root")
PASSWD =    os.environ.get("LMI_CIMOM_PASSWORD", "blank")

def id_generator(size=6, chars=string.ascii_uppercase + string.digits):
   return ''.join(random.choice(chars) for x in range(size))
#setup
conn = lmishell.connect(HOST, USER, PASSWD)
cs = conn.root.cimv2.PG_ComputerSystem.first_instance()
lams = conn.root.cimv2.LMI_AccountManagementService.first_instance()

#create
for i in range(10):
    myuser = "lmishell-user" + id_generator(10)
    print myuser
    user = lams.CreateAccount(Name=myuser, System=cs)
    user_mod = conn.root.cimv2.LMI_Account.first_instance({"Name" : myuser})
    grp_mod = conn.root.cimv2.LMI_Group.first_instance({"Name": myuser})
    anystring = 'x' * i
    myshell = '/bin/' + anystring
    myhome = '/tmp/' + anystring
    user_mod.LoginShell = myshell
    user_mod.HomeDirectory = myhome
    user_mod.push()
    print user_mod.DeleteUser()
    print grp_mod.DeleteGroup()
---------------------



Actual results:
error code = 4097
LMIReturnValue(rval=4097, rparams=NocaseDict({}), errorstr='')
LMIReturnValue(rval=4097, rparams=NocaseDict({}), errorstr='')


cimserver when running manually says:

(process:30434): GLib-GObject-CRITICAL **: g_value_array_get_nth: assertion `value_array != NULL' failed
(process:30434): GLib-GObject-CRITICAL **: g_value_get_long: assertion `G_VALUE_HOLDS_LONG (value)' failed

Expected results:
I can do deletion

Additional info: