increase default test timeout to 15s
increase default test timeout to 15s

this is mostly due to the ./kv test clocking in at around
10s most of the time (failing perhaps 65% of the time on
my relatively fast (or so I thought) machine).

We should factor out the txn_correctness_test. I had tried
that, but could not complete it due to import issues.
The correctness test alone takes around 5s.

slavau/cockroach,mbonaci/cockroach,jess-edwards/cockroach,bg451/cockroach,yosiat/cockroach,arjun4084346/cockroach,paperstreet/cockroach,nieyy/cockroach,arypurnomoz/cockroach,nkhuyu/cockroach,mbertschler/cockroach,alunarbeach/cockroach,es-chow/cockroach,c4pt0r/cockroach,cockroachdb/cockroach,jmank88/cockroach,il9ue/cockroach,alex/cockroach,freakynit/cockroach,veteranlu/cockroach,bg451/cockroach,vaibhavarora/cockroach,ngaut/cockroach,jamesgraves/cockroach,veteranlu/cockroach,XisiHuang/cockroach,cuongdo/cockroach,maxlang/cockroach,GokulSrinivas/cockroach,jess-edwards/cockroach,yiixiansheng/cockroach,freakynit/cockroach,alunarbeach/cockroach,linearb/cockroach,veteranlu/cockroach,es-chow/cockroach,il9ue/cockroach,hassyma/cockroach,domluna/cockroach,nkhuyu/cockroach,nkhuyu/cockroach,cuongdo/cockroach,sunya123/cockroach,slavau/cockroach,linearb/cockroach,vaibhavarora/cockroach,vaibhavarora/cockroach,vaibhavarora/cockroach,es-chow/cockroach,SustainFund/cockroach,cuongdo/cockroach,jgautheron/cockroach,GokulSrinivas/cockroach,glycerine/cockroach,paperstreet/cockroach,vaibhavarora/cockroach,hassyma/cockroach,yosiat/cockroach,cuongdo/cockroach,XisiHuang/cockroach,loucash/cockroach,arypurnomoz/cockroach,petermattis/cockroach,jess-edwards/cockroach,bg451/cockroach,veteranlu/cockroach,ngaut/cockroach,yiixiansheng/cockroach,es-chow/cockroach,mbonaci/cockroach,chrisseto/cockroach,marcuswestin/cockroach,marcuswestin/cockroach,alunarbeach/cockroach,paperstreet/cockroach,cuongdo/cockroach,jess-edwards/cockroach,alunarbeach/cockroach,iqstack/cockroach,yosiat/cockroach,hassyma/cockroach,mbertschler/cockroach,mbertschler/cockroach,nieyy/cockroach,GokulSrinivas/cockroach,sunya123/cockroach,mbertschler/cockroach,iqstack/cockroach,linearb/cockroach,loucash/cockroach,yiixiansheng/cockroach,iqstack/cockroach,domluna/cockroach,fengshao0907/cockroach,XisiHuang/cockroach,marcuswestin/cockroach,chrisseto/cockroach,iqstack/cockroach,arjun4084346/cockroach,vivekmenezes/cockroach,slavau/cockroach,alex/cockroach,marcuswestin/cockroach,alunarbeach/cockroach,XisiHuang/cockroach,ajayaa/cockroach,jmank88/cockroach,il9ue/cockroach,vivekmenezes/cockroach,vaibhavarora/cockroach,linearb/cockroach,maxlang/cockroach,mbonaci/cockroach,il9ue/cockroach,nieyy/cockroach,iqstack/cockroach,bg451/cockroach,fengshao0907/cockroach,maxlang/cockroach,petermattis/cockroach,briceburg/cockroach,SustainFund/cockroach,jamesgraves/cockroach,il9ue/cockroach,arjun4084346/cockroach,paperstreet/cockroach,c4pt0r/cockroach,vivekmenezes/cockroach,jgautheron/cockroach,alex/cockroach,Abioy/cockroach,jgautheron/cockroach,maxlang/cockroach,yosiat/cockroach,cuongdo/cockroach,SustainFund/cockroach,paperstreet/cockroach,loucash/cockroach,nieyy/cockroach,jmank88/cockroach,XisiHuang/cockroach,sunya123/cockroach,briceburg/cockroach,yananzhi/cockroach,maxlang/cockroach,abhishekgahlot/cockroach,jamesgraves/cockroach,glycerine/cockroach,jmank88/cockroach,yosiat/cockroach,iqstack/cockroach,ajayaa/cockroach,arypurnomoz/cockroach,alex/cockroach,petermattis/cockroach,nkhuyu/cockroach,nkhuyu/cockroach,loucash/cockroach,veteranlu/cockroach,cockroachdb/cockroach,marcuswestin/cockroach,nieyy/cockroach,vivekmenezes/cockroach,sunya123/cockroach,cockroachdb/cockroach,chrisseto/cockroach,c4pt0r/cockroach,cockroachdb/cockroach,yananzhi/cockroach,arypurnomoz/cockroach,jmank88/cockroach,fengshao0907/cockroach,GokulSrinivas/cockroach,mbonaci/cockroach,arjun4084346/cockroach,abhishekgahlot/cockroach,marcuswestin/cockroach,es-chow/cockroach,cuongdo/cockroach,petermattis/cockroach,freakynit/cockroach,alex/cockroach,yananzhi/cockroach,glycerine/cockroach,XisiHuang/cockroach,vivekmenezes/cockroach,yiixiansheng/cockroach,loucash/cockroach,Abioy/cockroach,vivekmenezes/cockroach,iqstack/cockroach,petermattis/cockroach,mbonaci/cockroach,chrisseto/cockroach,paperstreet/cockroach,arjun4084346/cockroach,c4pt0r/cockroach,Abioy/cockroach,petermattis/cockroach,SustainFund/cockroach,maxlang/cockroach,cockroachdb/cockroach,c4pt0r/cockroach,nieyy/cockroach,GokulSrinivas/cockroach,linearb/cockroach,ngaut/cockroach,arypurnomoz/cockroach,linearb/cockroach,jess-edwards/cockroach,chrisseto/cockroach,vivekmenezes/cockroach,mbertschler/cockroach,domluna/cockroach,nkhuyu/cockroach,vaibhavarora/cockroach,ajayaa/cockroach,veteranlu/cockroach,abhishekgahlot/cockroach,sunya123/cockroach,jess-edwards/cockroach,ngaut/cockroach,GokulSrinivas/cockroach,yiixiansheng/cockroach,domluna/cockroach,slavau/cockroach,briceburg/cockroach,yananzhi/cockroach,glycerine/cockroach,freakynit/cockroach,jgautheron/cockroach,SustainFund/cockroach,jess-edwards/cockroach,marcuswestin/cockroach,hassyma/cockroach,petermattis/cockroach,fengshao0907/cockroach,mbertschler/cockroach,freakynit/cockroach,es-chow/cockroach,arjun4084346/cockroach,hassyma/cockroach,loucash/cockroach,bg451/cockroach,abhishekgahlot/cockroach,jamesgraves/cockroach,yananzhi/cockroach,il9ue/cockroach,ajayaa/cockroach,cuongdo/cockroach,linearb/cockroach,glycerine/cockroach,arjun4084346/cockr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