Add config for the expire age of partial segment messages.

Set the value to 30 days based on default value in code,
then it could be customized via res overlay mechanism.

Change-Id: Ia219aa59dd009d831abb03b5921763ade38f0c50

Change-Id: I46fda3389a34b99b6e8e5bdb07a16a28ba49ca23
Conflicts:
core/res/res/values/symbols.xml