accounts: easier ip account discovery

An ip2ip account is a well hidden feature, since we request users to
fill all fields when creating a SIP account.
This commit reduces the discovery barrier by making only the Alias field
mandatory. A warning is displayed if the user tries to create an account
without an hostname (e.g a IP2IP account).

Change-Id: I9f8a1b6d56485fa73f403fe99f918b18c274f355
Tuleap: #694
diff --git a/ring-android/app/src/main/res/values/integers.xml b/ring-android/app/src/main/res/values/integers.xml
new file mode 100644
index 0000000..353c4cf
--- /dev/null
+++ b/ring-android/app/src/main/res/values/integers.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <integer name="register_sip_account_actionid">1000</integer>
+</resources>
\ No newline at end of file