examples/http_server*: Update for buffered-like streams (read line by line).

Since "read-exactly" stream refactor, where stream.read(N) will read
exactly N bytes (unless EOF), http_server* examples can't any longer do
client_socket.read(4096) and expect to get full request (it will block
on HTTP/1.1 client). Instead, read request line by line, as the HTTP
protocol requires.

examples/network/http_server.py

@@ -34,7 +34,13 @@ def main(use_stream=False):
         if use_stream:
             # MicroPython socket objects support stream (aka file) interface
             # directly.
-            print(client_s.read(4096))
+            req = client_s.readline()
+            print(req)
+            while True:
+                h = client_s.readline()
+                if h == b"" or h == b"\r\n":
+                    break
+                print(h)
             client_s.write(CONTENT % counter)
         else:
             print(client_s.recv(4096))

examples/network/http_server_ssl.py

@@ -42,8 +42,13 @@ def main(use_stream=True):
             # next request they issue will likely be more well-behaving and
             # will succeed.
             try:
-                req = client_s.read(4096)
+                req = client_s.readline()
                 print(req)
+                while True:
+                    h = client_s.readline()
+                    if h == b"" or h == b"\r\n":
+                        break
+                    print(h)
                 if req:
                     client_s.write(CONTENT % counter)
             except Exception as e: