Default load balance algorithm is "source" when TLS passthrough

[ibm-nishizaki]

I have noticed that default router load balance algorithm is "source" when TLS passthrough mode.
By this reason, requests from same IP address are distributed to same container.

Why is default algorithm "source" ? I confirm this option was modified below commit, but the reason is unclear because commit message is just "sticky sessions".

commit ID: 98c91e7

            {{ if eq $cfg.TLSTermination "passthrough" }}Add commentMore actions
backend be_tcp_{{$cfgIdx}}
-  balance leastconn
+  balance source

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