Description of problem:
(derived from https://bugzilla.redhat.com/show_bug.cgi?id=1304394#c9)

Calling e.g.:

self.add_copy_spec("/var/log/secure*", sizelimit=self.limit)

for a low log_size / sizelimit collects /var/log/secure and then the _oldest_ secure.* file instead of newest ones.

The reason is, we order the files alphanumerically. That works well for /var/log/messages.1 style of log-rotating only.


Version-Release number of selected component (if applicable):
sos-3.4-*


How reproducible:
100%


Steps to Reproduce:
1. Have /var/log/secure* (or /var/log/messages*) with many ~1MB files, log-rotated with timestamp suffix like /var/log/secure-20170828
2. sosreport -o logs --log-size=10
3. Check collected secure* or messages* files


Actual results:
- /var/log/messages and then _oldest_ files are collected
- same applies for /var/log/secure files


Expected results:
- /var/log/messages and then other _newest_ files should be collected
- same should apply for /var/log/secure files

Additional info: