Request for reviews (XS): 6868486: timouts and outOfMemory in regression tests

[Vladimir Kozlov]

http://cr.openjdk.java.net/~kvn/6868486/webrev.00

Fixed 6868486: timouts and outOfMemory in regression tests

Problem:
Nightly testing uses some very old machines which are slow,
have one cpu(core) and <= 1Gb memory.
Such machines are not server class for VM so it use
Serial GC which also slowdown execution time.

Solution:
Increase timeout for all bug's tests.
Increase heap size for 6851282 test.

Reviewed by:

Fix verified (y/n): y, bug's tests

Other testing:
JPRT