Fix minor spelling mistakes Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>

UTIL: Fix memory leak in switch_creds If we are already requested used then we needn't to call setreeuid(), setresgid(). But we forgot to relase local struct sss_creds *ssc, which is used for returnig saved credentials. Reviewed-by: Petr Cech <pcech@redhat.com>

KRB5: Do not switch_creds() if already the specified user The code didn't have to handle this case previously as sssd_be was always running as root and switching to the ccache as the user logging in. Also handle NULL creds on restore_creds() in case there was no switch. One less if-condition and fewer indentation levels. Related: https://fedorahosted.org/sssd/ticket/2370 Reviewed-by: Sumit Bose <sbose@redhat.com> Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>

UTIL: Move become_user outside krb5 tree In order for several other SSSD processes to run as a non-root user, we need to move the functions to become another user to a shared space in our source tree. Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>