Description of problem:

[RFE] sssctl analyze request list should display a msg if debug is not enabled

Currently, `sssctl analyze request list` returns nothing if sssd debugging is not enabled.

[root@adjoin sssd-test]# sssctl analyze request list
[root@adjoin sssd-test]#

It should give a msg something like 'enable sssd debugging under the [nss] section in order to view the list of request'

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