Change Values for Opportunistic Entry & Exit Thresholds

Due to the generally higher quality of these networks, we expanded the
entry and exit criteria of opportunistic networks.

Test: Make
Change-Id: Iaac1641db1d6a07bcce6dd194765c79c83a92070
Merged-In: Iaac1641db1d6a07bcce6dd194765c79c83a92070