sonic-buildimage: Upgrade host-sflow to v2.42-1

[vidhya-rajan]

*Fixing dynamic agentIP reconfiguration issues by upgrading to v2.42-1. *Dropmon patch files modified to be inline with v2.42-1 version.

Signed-off-by: vidhya vidhyar@celestica.com

Why I did it

1. Agent IP dynamic reconfiguration had issues where correct Agent IP was not sent in the sample packet after agent IP is removed.
2. Default Agent IP was selected as multicast IP if agent IP was not configured. Agent IP should be configured based on the collector IP reachable interface instead of multicast IP

How I did it

1. Enable sflow feature by using 'config feature state sflow enabled '
2. Ensure sflow docker is instantiated successfully before executing sflow rleated config commands.
3. Enable sflow globally by using 'config sflow enable'
4. Configure a valid agenID using the command config sflow agent-id add
5. Remove the configured agent-id using config sflow agent-id del

How to verify it

The sampled packets were captured and the right agent IP configured was verfied

Which release branch to backport (provide reason below if selected)

• 201811
• 201911
• 202006
• 202012
• 202106
• 202111
• 202205
• 202211

Description for the changelog

Ensure to add label/tag for the feature raised. example - PR#2174 under sonic-utilities repo. where, Generic Config and Update feature has been labelled as GCU.

Link to config_db schema for YANG module changes

A picture of a cute animal (not mandatory but encouraged)

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: vidhya-rajan (1e03500)

[vidhya-rajan]

/AzurePipelines run Azure.sonic-buildimage

[azure-pipelines]

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