[timers] Output of Timers is not in order on Linux

[qiaojingx]

Description

This is a regression issue. The output order of Timers.js changes each time on Linux.

Test Code

Timers.js

Steps to Reproduction

1. make BOARD=linux
2. ./outdir/linux/release/jslinux samples/Timers.js

Actual Result

Expected Result

Test Builds

Branch	Commit Id	Target Device	Test Date	Result
master	687af46	Linux	Nov 8, 2017	Fail
master	6d751ea	Linux	Nov 8, 2017	Pass

Additional Information

[jimmy-huang]

This regression is caused by reverting the linux timers back to old way of doing timers, since the new timers used in Zephyr is more accurate but it doesn't build for linux on Mac. So until we find a way to add async timers support on Mac, the linux timers will be inaccurate.

[grgustaf]

Marking as low priority because Linux is just a testing target, not a real use case.