The instructions for how to do this for 8.0 are included in the latest version of the Isilon OneFS Security Configuration Guide https://support.emc.com/docu79792_OneFS-8.0.1-Security-Configuration-Guide.pdf
While those instructions have not been tested on 7.2 setting the SSH and shell timeouts are standard Unix functionality so they should work fine.
Not exactly sure what you want to achieve?
In case you want to log out users forcefully after some period of inactivity,
this is usually done on shell level by setting
export TMOUT=120 #(120 seconds in this example)
somewhere in /etc/profile on the machine to which users log in (not where they start ssh).
On the other hand, if you happen to know exactly what sshd config parameters
you want to set, the place on Isilon is: /etc/mcp/templates/sshd_config
for general instructions on how to edit this file (while the KB article address a different question about ssh).