k5start with -S and -I option renews ticket every -K minutes instead of checking the validity

[MFriedmann]

Example call to get a nfs service ticket:
k5start -f -S nfs -I -K 5 -L -v -p -b

Every 5 minutes k5start wakes up and renews the nfs service tickets completely instead of checking for validity and renewing only when needed.

The same happens with -H option. Seems like the validity is not correctly checked when checking only for a service ticket and not for a tgt.

[MFriedmann]

Version used: kstart-4.2-10.el8.x86_64
OS: RHEL 8