tools: Set umask before calling mkdtemp()
When adcli is called from sssd it inherits the sssd's umask (0177) and as the default sssd.service file drops CAP_DAC_OVERRIDE, the result is that the directory is created with mode 0600 and the krb5.conf snippet can't be created even running as root.
Signed-off-by: Samuel Cabrero scabrero@suse.de