Make soong lock file sync time configurable..

- Add SOONG_LOCK_TIMEOUT environmental variable for users to set a
duration (e.g. 1h), which defaults to the current 10 seconds.
- Instead of logging once per second waiting to acquire the lock,
only log once before the first wait

Fixes: 131854539
Test: make; open another tab and make
Change-Id: I0a02a1b071964f74473a5f55034f916526e1b309