[show]: If rotated syslog.1 file exists, concatenate output of syslog.1 and syslog #159
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In the case /var/log/syslog was recently rotated,
show logging
could potentially display no or very few log messages. WIth this PR, if /var/log/syslog.1 exists, we will display the contents of /var/log/syslog.1 followed by the contents of /var/log/syslog, thus ensuringshow logging
always displays a reasonable amount of recent log messages.