Reduce logging for failed http plugin calls

[heifner]

Change Description

• Public API nodes with default info level logging for http_plugin have huge logs filled with:

Dec 12 00:00:13 node1 nodeos[29695]: error 2020-12-12T00:00:13.966 nodeos    http_plugin.cpp:964           handle_exception     ] FC Exception encountered while processing chain.push_transaction
Dec 12 00:00:14 node1 nodeos[29695]: error 2020-12-12T00:00:14.061 nodeos    http_plugin.cpp:964           handle_exception     ] FC Exception encountered while processing chain.push_transaction

This PR reduces this noise. Full details can be enabled via debug logging for private API nodes. There is no error in the system if a push_transaction generates an exception. That is normal operating conditions.

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