Add http.client.request() alias

Fix compatibility with original tarantool/http client.

Follow up #2530

src/lua/httpc.lua

@@ -268,7 +268,7 @@ local function http_default_wrap(fname)
 end
 
 for _, name in ipairs({ 'get', 'delete', 'trace', 'options', 'head',
-                     'connect', 'post', 'put', 'patch', }) do
+                     'connect', 'post', 'put', 'patch', 'request'}) do
     this_module[name] = http_default_wrap(name)
 end
 

test/app-tap/http_client.test.lua

@@ -50,7 +50,7 @@ end
 local server, URL = start_server()
 
 test:test("http.client", function(test)
-    test:plan(6)
+    test:plan(7)
 
     local r = client.get(URL)
     test:is(r.status, 200, 'simple 200')
@@ -60,6 +60,9 @@ test:test("http.client", function(test)
     test:ok(tonumber(r.headers["content-length"]) > 0,
         "content-length > 0")
     test:is(client.get("http://localhost:0/").status, 595, 'bad url')
+
+    local r = client.request('GET', URL)
+    test:is(r.status, 200, 'request')
 end)
 
 test:test("cancel and timeout", function(test)