add missing signal.h include
Merge pull request #1822 from vito/patch-1

add missing signal.h include
Add correct exit value to failed tests
Merge pull request #1824 from mattsta/fix-test-error-signal

Add correct exit value to failed tests
Test: tcl client, unset deferred var on close.
Test: Tcl client initial support for automatic reconnection.
Sentienl/Redis test: enable link reconnection in instances.tcl.
Test: use higher level redis.tcl proc to read replies.