runtime/testdata/testprog: increase GCFairness2 timeout to 1s
runtime/testdata/testprog: increase GCFairness2 timeout to 1s

OpenBSD's scheduler causes preemption to take 20+ms, so 30ms is not
enough time for 3 goroutines to run. This change continues to sleep for
30ms, but if it finds that the 3 goroutines have not run, it sleeps for
an additional 1s before declaring failure.

Updates #17712

Change-Id: I3e886e40d05192b7cb71b4f242af195836ef62a8
Reviewed-on: https://go-review.googlesource.com/32634
Reviewed-by: Rick Hudson <838bd060584c511f21c75c69ea04b7b120d86af0@golang.org>
Run-TryBot: Quentin Smith <d6b8e48afb2534b213e391cab43016505747a234@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>

ImJasonH/go,codestation/go,codestation/go,Cofyc/go,vsekhar/elastic-go,vsekhar/elastic-go,CAFxX/go,linux-on-ibm-z/go,derekmarcotte/go,polyverse-security/go,golang/go,akutz/go,polyverse-security/go,nawawi/go,suncycheng/go,suncycheng/go,derekmarcotte/go,josharian/go,nawawi/go,golang/go,goodlang/good,Cofyc/go,codestation/go,polyverse-security/go,ImJasonH/go,derekmarcotte/go,codestation/go,goodlang/good,josharian/go,nawawi/go,Cofyc/go,josharian/go,nawawi/go,vsekhar/elastic-go,CAFxX/go,golang/go,ImJasonH/go,codestation/go,cloudflare/go,christopher-henderson/Go,goodlang/good,CAFxX/go,cloudflare/go,akutz/go,suncycheng/go,josharian/go,linux-on-ibm-z/go,akutz/go,polyverse-security/go,ImJasonH/go,goodlang/good,Cofyc/go,derekmarcotte/go,suncycheng/go,codestation/go,polyverse-security/go,cloudflare/go,cloudflare/go,goodlang/good,Cofyc/go,derekmarcotte/go,linux-on-ibm-z/go,linux-on-ibm-z/go,cloudflare/go,suncycheng/go,suncycheng/go,polyverse-security/go,ImJasonH/go,linux-on-ibm-z/go,josharian/go,ImJasonH/go,cloudflare/go,nawawi/go,josharian/go,polyverse-security/go,josharian/go,derekmarcotte/go,Cofyc/go,akutz/go,nawawi/go,cloudflare/go,CAFxX/go,akutz/go,linux-on-ibm-z/go,linux-on-ibm-z/go,suncycheng/go,codestation/go,ImJasonH/go,nawawi/go,polyverse-security/go,CAFxX/go,goodlang/good,akutz/go,akutz/go,vsekhar/elastic-go,goodlang/good,goodlang/good,suncycheng/go,akutz/go,CAFxX/go,cloudflare/go,CAFxX/go,golang/go,nawawi/go,derekmarcotte/go,CAFxX/go,golang/go,golang/go,vsekhar/elastic-go,codestation/go,Cofyc/go,vsekhar/elastic-go,linux-on-ibm-z/go,vsekhar/elastic-go,golang/go,derekmarcotte/go,josharian/go,vsekhar/elastic-go,ImJasonH/go,golang/go,Cofyc/go