feature: add '--- curl_options' and '--- curl_protocol' section

[woodgear]

feature: add '--- curl_options' and '--- curl_protocol' section which could combine with '--- http2' to construct a request by curl.

[xiaocang]

Hi @woodgear, documentation is needed here

[xiaocang]

The Test::Nginx document is in pod format (check https://perldoc.perl.org/perlpod for help), and the documentation for these two new options can be just added to the current .pm file like other options

[woodgear]

update to add doc。 not sure I'm doing it right.

[woodgear]

update

[woodgear]

when will this pr merge?

[xiaocang]

Merged with minor tweaks, thanks for the contribution!

diff --git a/lib/Test/Nginx/Socket.pm b/lib/Test/Nginx/Socket.pm
index 6901192..398fbd8 100644
--- a/lib/Test/Nginx/Socket.pm
+++ b/lib/Test/Nginx/Socket.pm
@@ -3011,7 +3011,7 @@ Set protocol (such as http/https) when sending request using 'curl'.

 Add extra command line options when using 'curl' to send request.

-Below example will send https request via curl:
+Below is an example for sending an insecure https request using 'curl':

     --- http2
     --- curl_options: -k

[woodgear]

cool ^_^.