ipa-uuid: emit a message when unexpected mod type is encountered
    
    This patch is related to the following defect reported by covscan of FreeIPA
    master code:
    
    """
    Error: DEADCODE (CWE-561): /daemons/ipa-slapi-plugins/ipa-uuid/ipa_uuid.c:796:
    cond_const: Condition "modtype != 1", taking false branch. Now the value of
    "modtype" is equal to 1.
    /daemons/ipa-slapi-plugins/ipa-uuid/ipa_uuid.c:796:
    cond_const: Condition "modtype != 4", taking false branch. Now the value of
    "modtype" is equal to 4.
    /daemons/ipa-slapi-plugins/ipa-uuid/ipa_uuid.c:941:
    equality_cond: Jumping to case "1".
    /daemons/ipa-slapi-plugins/ipa-uuid/ipa_uuid.c:957: equality_cond: Jumping to
    case "4".
    /daemons/ipa-slapi-plugins/ipa-uuid/ipa_uuid.c:940: intervals: When
    switching on "modtype", the value of "modtype" must be in one of the following
    intervals: {[1,1], [4,4]}.
    /daemons/ipa-slapi-plugins/ipa-uuid/ipa_uuid.c:940: dead_error_condition: The
    switch value "modtype" cannot reach the default case.
    /daemons/ipa-slapi-plugins/ipa-uuid/ipa_uuid.c:1031: dead_error_begin:
    Execution cannot reach this statement: "default:".
    """
    
    The patch is a part of series related to
    https://fedorahosted.org/freeipa/ticket/4795
    
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>