[nfs-ganesha] Update nfs-ganesha service log locations

[soumyakoduri]

nfs-ganesha service logs are now located at "/var/log/ganesha/"
directory by default. Updating the same in sos plugin.

Signed-off-by: Soumya Koduri skoduri@redhat.com

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[dang]

Looks good to me.