btmp should be rotated more frequently

The rotation of btmp seems to be too infrequent considering that it's easy to grow this file from an external machine.

In my testing, I generated (bad) SSH connections at a rate of 10 attempts/sec and was able to grow the btmp file of ~350MB/day. At this rate, btmp would reach the 10GB in a month period (default rotation period). A higher connection attempt rate is probably possible on publicly exposed SSH servers.

Here's a proposed logrotate configuration for btmp that would improve the situation:

/var/log/btmp {
    missingok
    notifempty
    weekly
    create 0660 root utmp
    rotate 8
    compress
    delaycompress
    maxsize 10M
}

The delaycompress makes it easy to use "lastb -f /var/log/btmp.1" while still benefiting from the compression (btmp compresses well).

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: logrotate 3.8.7-1ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Apr 30 11:20:14 2014
InstallationDate: Installed on 2014-01-26 (93 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140124)
SourcePackage: logrotate
UpgradeStatus: No upgrade log present (probably fresh install)