Download newer version (8.23.0-2) of rsyslog from jessie-backports in hopes of eliminating memory leaks #1912
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The latest version of rsyslog from the stable Debian Jessie repo (version 8.4.2-1) has a memory leak issue that takes a couple months to consume all system RAM on 4GB systems.
The changelog for rsyslog shows multiple memory leak fixes since 8.4.2. However, the latest package compatible with Debian Jessie (available from jessie-backports) is 8.23.0, which is still behind current upstream version of 8.37.0, so it may still have some memory leaks, but hopefully enough bug fixes are in 8.23.0 to fix this issue presented in SONiC.
This PR updates the version of rsyslog in both the base image and all Docker containers.