http_client: log failures to resize the buffer
http_client: log failures to resize the buffer

At present flb_http_do() will not return an error when the client reads
the maximum amount into the buffer, it will just return a partial
response. Most plugins which make use of this API do not check this
error condition, leading to confusion when it occurs but existing logs
report everything as fine.

These issues can usually be resolved by simply increasing the configured
buffer size for a given plugin, which is what the log message hints at.

Fixes #2214.

Signed-off-by: Aaron Jacobs <e0b65152f183aaa43851860717e607da9bc1afab@crescendotechnology.com>

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