fix curl of test.t on CI (#432)

* add `connection: keep-alive` to test.t

* --no-keepalive

* -H "Connection: close"

* -H "Connection:"

* --http1.0

* grep -v 'connection: '

Author: kxc-wraikny

example/ex01/test/test.t

@@ -30,7 +30,8 @@ Check endpoints
 
 Check endpoints
   $ curl -si localhost:$PORT/student/from-person \
-  >   -d '{"kind":"with-id","value":0}'
+  >   -d '{"kind":"with-id","value":0}' \
+  >   | grep -v 'connection: '
   HTTP/1.1 422 Status 422
   Content-Type: application/json
   content-length: 22
@@ -39,7 +40,8 @@ Check endpoints
 
 Check endpoints
   $ curl -si localhost:$PORT/student/from-person \
-  >   -d '{"kind":"student","studentId":0}'
+  >   -d '{"kind":"student","studentId":0}' \
+  >   | grep -v 'connection: '
   HTTP/1.1 400 Status 400
   Content-Type: application/json
   content-length: 1611

example/ex02/test/test.t

@@ -57,8 +57,9 @@ Start the client program.
     status = `Unpaid }
 
 Check endpoints
-  $ curl -si localhost:$PORT/orders/get \
-  >   -d '{"products": [0, 2, 5, 9]}'
+  $ curl -si localhost:$PORT/orders/get  \
+  >   -d '{"products": [0, 2, 5, 9]}' \
+  >   | grep -v 'connection: '
   HTTP/1.1 200 Status 200
   Content-Type: application/json
   content-length: 281
@@ -67,7 +68,8 @@ Check endpoints
 
 Check endpoints
   $ curl -si localhost:8082/order/status/update \
-  >   -d '{"_0": 10, "_1": "Shipped"}'
+  >   -d '{"_0": 10, "_1": "Shipped"}' \
+  >   | grep -v 'connection: '
   HTTP/1.1 400 Status 400
   Content-Type: application/json
   content-length: 22
@@ -76,7 +78,8 @@ Check endpoints
 
 Check endpoints
   $ curl -si localhost:8082/product/details/update \
-  >   -d '{ "_0": 0, _1: { "price": 1000 } }'
+  >   -d '{ "_0": 0, _1: { "price": 1000 } }' \
+  >   | grep -v 'connection: '
   HTTP/1.1 400 Status 400
   Content-Type: application/json
   content-length: 1547