Fix documentation of requestCode parameter.

It's not correct to state requestCode is 'currently not used'. It can be
used to differentiate multiple PendingIntents since a number of Android
versions now. Also, the introduction block of the PendingIntent
documentation explicitly states this as a possible use:
"If you truly need multiple distinct PendingIntent objects active at the same
time [...], then you will need to ensure there is something that is different
about them to associate them with different PendingIntents. This may be
any of the Intent attributes considered by Intent.filterEquals, or
different request code integers supplied [...]"

So fix the documentation inconsistency to make the possible use
immediately clear.

Change-Id: Ia65d7a5ab12c2c3ee1aa1c5107e5ea8fd937b765
Fix wrong log information in DevicePolicyManagerService

When user reset password their password,
if password doesn't match target quality of device,
DPM print a log why can't reset password.
however log message isn't correct information.
in log context, it have to exist current quality
and target quality. this patch can help print correct log.

Change-Id: I5c8fb1c77ddbe1bdbc76e35038c897e2e8efb077