Shorten testConcurrentAccess2 time as it is making the travis tests take too long.
Shorten testConcurrentAccess2 time as it is making the travis tests take too long.

stephencelis/SQLite.swift,stephencelis/SQLite.swift,hyperconnect/SQLite.swift,stephencelis/SQLite.swift,hyperconnect/SQLite.swift,hyperconnect/SQLite.swift,stephencelis/SQLite.swift