Description of problem:
When users consider resetting the Kerberos ticket policy to the default values
(ipa krbtpolicy-reset), there is no quick and easy way for them to find out
what the defaults are.

Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1. Change max renew, max life, or both to a custom value.
2. After some time, decide to return to the defaults.
3. Try to remember what the defaults were and if they really suit you.

Actual results:


Expected results:
The output of ipa krbtpolicy-reset --help could show the global default values.

In the web UI, the defaults could be displayed under Policy > Kerberos Ticket
Policy. But since it's not possible to reset the policy in the UI, this might
not be necessary.

Additional info: