http_ep_server_test: Enable cookie test

Change-Id: I85267e92a78cfc0cc76d50d4125bdb57df59f784
http_ep_server_test: Do not use default host and port for each test

If a tes fails without properly shutting down the server any following test
will fail because server won't be able to attach to default IP and address.
This patch assign any available port and ip in the host for each tests.

Change-Id: I52e1c7550be28c78353329eeaf614f4e5d174b7d
http_ep_server_test: Adapted test 1

Change-Id: I6ee53f174c58a9f3a94dbf12d1e57fa3338b63bf
http_ep_server_test: Adapted test 2

Change-Id: Ibaa4610ae931b4cf92b05065e2f3dbb00204bc2d
http_ep_server_test: Adapted test 3

Change-Id: I5b7f0e7022153e2ba2c81e6e09c047cf596d13b1
http_ep_server_test: Enable POST tests

Change-Id: Ifa6b7ac5900ee816be0e20e6d86e81d9710087da
http_ep_server_test: Enable OPTIONS test

Change-Id: Ie355266506bc527d66b7d77be387341b65023991