Operation:
In `esp_http_client_set_url`, we check for if old_host is same as new_host.
Delete and open new connection if host is different.
Issue:
We just pointed `client->connection_info.host` to `old_host` and reassigned it.
This made old_host and new_host always point to same location and hence, using old_host with new request.
Fix:
Made a separate copy for old_host using strdup.
Closes https://github.com/espressif/esp-idf/issues/2631
Signed-off-by: Vikram Dattu <vikram.dattu@espressif.com>
