Allow some slop on socket time values

Depending on the kernel HZ compile-time setting, sometimes
timeouts cannot be set exactly.

This change allows for "tcpUserTimeout" values to be inaccurate
by up to 10ms.

Bug: 115848572
Test: Ran test
Change-Id: Ib626037522f8ab6d64542f6a4c7aac6dabba33f0
(cherry picked from commit b53e50ac)