Fix check online in DEBIAN/postinst from ping to curl (#370)

* Fix check online in DEBIAN/postinst from ping to curl

In some virtual machines ping sockets may be disabled, but curl works good.

Signed-off-by: Viacheslav Bocharov <adeep@lexina.in>

* Update URL_CHECK_ONLINE to https://checkonline.home-assistant.io/online.txt

---------

Signed-off-by: Viacheslav Bocharov <adeep@lexina.in>

homeassistant-supervised/DEBIAN/postinst

@@ -14,7 +14,7 @@ SERVICE_DOCKER="docker.service"
 SERVICE_NM="NetworkManager.service"
 
 # Read infos from web
-URL_CHECK_ONLINE="checkonline.home-assistant.io"
+URL_CHECK_ONLINE="https://checkonline.home-assistant.io/online.txt"
 URL_VERSION="https://version.home-assistant.io/stable.json"
 HASSIO_VERSION=$(curl -s ${URL_VERSION} | jq -e -r '.supervisor')
 URL_APPARMOR_PROFILE="https://version.home-assistant.io/apparmor.txt"
@@ -65,7 +65,7 @@ info "Restarting docker service"
 systemctl restart "${SERVICE_DOCKER}"
 
 # Check network connection
-while ! ping -c 1 -W 1 ${URL_CHECK_ONLINE}; do
+while ! curl -q ${URL_CHECK_ONLINE} >/dev/null 2>&1 ; do
     info "Waiting for ${URL_CHECK_ONLINE} - network interface might be down..."
     sleep 2
 done