commit 15eeedd83c258ae7eec5065880b0887545124456
author Peter Qiu <zqiu@google.com> Thu Feb 16 10:27:40 2017 -0800
committer Peter Qiu <zqiu@google.com> Fri Feb 24 09:25:06 2017 -0800
tree a2440c7754adab3161700c3561ba4c8aa8c810ef
parent 5a2c880635ee0e2d3498ba22c584b61e15440708

hotspot2: add config parser for legacy Passpoint configuration file

For Hotspot 2.0 Release 1, most of the configuration data are
already stored as part of WifiConfiguration across multiple files
in N and older.  There are number of fields contained in the
legacy Passpoint configuration file
(/data/misc/wifi/PerProviderSubscription.conf) that needed in order
to complete the configuration.  Mainly:
    - Friendly Name
    - Roaming Consortium OI
    - Realm
    - IMSI (for SIM credential)

So add the parsing support for the legacy Passpoint configuration
file to retrieve the missing configuration fields.

Refer to the javadoc in LegacyPasspointConfigParser for the format
of the configuration file.

Bug: 34206769
Test: frameworks/opt/net/wifi/tests/wifitests/runtests.sh
Change-Id: I1d1a96a2534e123fcd06e91eaa9fc18af842bea1