sdk: Indicate that sessionTimeout is in minutes

This patch changes the SDK so that the documentation for the
"sessionTimeout" parameter explicitly indicates that the unit is
minutes.

Change-Id: I8412d2dc32868564f1766fcc23c16040d2b364d1
Signed-off-by: Juan Hernandez <juan.hernandez@redhat.com>
(cherry picked from commit 3e3cc34171499610d93b0ae9d65c6ce58148ead1)