SSSD loses track of the user's credential cache if kdestroy is used.

Steps to reproduce:
1. Log in online (or log in offline and then kinit)
1. Run {{{klist}}} and verify that it contains a valid TGT
1. Run {{{kdestroy}}} and verify that it reports "No credentials cache found"
1. Lock the screen and unlock it with your kerberos password.
1. Run {{{klist}}}
1. Run the following command:

ldbsearch -H /var/lib/sss/db/cache_DOMAIN.ldb name=USERNAME ccacheFile

Expected Results:
- {{{klist}}} should show new, valid credentials
- ccacheFile from the {{{ldbsearch}}} should be the same as listed by {{{klist}}}

Actual Results:
- {{{klist}}} continues to report "No credentials cache found"
- The {{{ccacheFile}}} is different from that expected by {{{klist}}}