Increase the timeout limit for TestConcurrentEvents
Increase the timeout limit for TestConcurrentEvents

After recent changes, TestConcurrentEvents began timing out. This increases the timeout limit to
7m for this test, ensure the Test has enough time to complete.

git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@236725 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-lldb,llvm-mirror/lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,llvm-mirror/lldb