Disable surefire forking in Travis-CI
Disable surefire forking in Travis-CI

Attempt to fix build issues.

See: https://github.com/travis-ci/travis-ci/issues/3396

wangyum/beam,dhalperi/beam,apache/beam,jasonkuster/incubator-beam,ravwojdyla/incubator-beam,tgroh/beam,wtanaka/beam,dhalperi/incubator-beam,yk5/beam,charlesccychen/beam,RyanSkraba/beam,ravwojdyla/incubator-beam,apache/beam,lukecwik/incubator-beam,markflyhigh/incubator-beam,vikkyrk/incubator-beam,robertwb/incubator-beam,apache/beam,staslev/beam,joshualitt/incubator-beam,eljefe6a/incubator-beam,jbonofre/beam,chamikaramj/beam,robertwb/incubator-beam,wtanaka/beam,chamikaramj/incubator-beam,markflyhigh/incubator-beam,jasonkuster/beam,chamikaramj/beam,rangadi/beam,eljefe6a/incubator-beam,chamikaramj/beam,RyanSkraba/beam,apache/beam,chamikaramj/beam,chamikaramj/beam,RyanSkraba/beam,amarouni/incubator-beam,wangyum/beam,yk5/beam,tgroh/incubator-beam,rangadi/beam,sammcveety/DataflowJavaSDK,charlesccychen/beam,chamikaramj/beam,rangadi/beam,peihe/DataflowJavaSDK,wtanaka/beam,chamikaramj/beam,apache/beam,rangadi/beam,rangadi/beam,wangyum/beam,markflyhigh/incubator-beam,sammcveety/incubator-beam,robertwb/incubator-beam,charlesccychen/beam,markflyhigh/incubator-beam,tweise/beam,iemejia/incubator-beam,RyanSkraba/beam,amarouni/incubator-beam,xsm110/Apache-Beam,amitsela/beam,RyanSkraba/beam,manuzhang/incubator-beam,lukecwik/incubator-beam,apache/beam,chamikaramj/beam,mxm/incubator-beam,joshualitt/DataflowJavaSDK,manuzhang/beam,lukecwik/incubator-beam,rangadi/incubator-beam,elibixby/DataflowJavaSDK,apache/beam,amitsela/incubator-beam,chamikaramj/beam,manuzhang/beam,charlesccychen/beam,tweise/incubator-beam,robertwb/incubator-beam,lukecwik/incubator-beam,lukecwik/incubator-beam,robertwb/incubator-beam,rangadi/beam,charlesccychen/incubator-beam,dhalperi/beam,tweise/beam,robertwb/incubator-beam,iemejia/incubator-beam,jbonofre/incubator-beam,lukecwik/incubator-beam,eljefe6a/incubator-beam,nevillelyh/DataflowJavaSDK,apache/beam,chamikaramj/incubator-beam,xsm110/Apache-Beam,peihe/incubator-beam,mxm/incubator-beam,jbonofre/beam,dhalperi/incubator-beam,amitsela/beam,charlesccychen/beam,markflyhigh/incubator-beam,robertwb/incubator-beam,jbonofre/beam,markflyhigh/incubator-beam,lukecwik/incubator-beam,RyanSkraba/beam,jasonkuster/beam,tgroh/beam,chamikaramj/beam,tgroh/incubator-beam,joshualitt/incubator-beam,jasonkuster/incubator-beam,markflyhigh/incubator-beam,robertwb/incubator-beam,elibixby/DataflowJavaSDK,wangyum/beam,manuzhang/beam,lukecwik/incubator-beam,lukecwik/incubator-beam,charlesccychen/incubator-beam,charlesccychen/beam,peihe/incubator-beam,charlesccychen/beam,yk5/beam,peihe/incubator-beam,xsm110/Apache-Beam,sammcveety/DataflowJavaSDK,tgroh/beam,robertwb/incubator-beam,jasonkuster/beam,sammcveety/incubator-beam,manuzhang/incubator-beam,apache/beam,staslev/incubator-beam,lukecwik/incubator-beam,apache/beam,joshualitt/DataflowJavaSDK,vikkyrk/incubator-beam,robertwb/incubator-beam,RyanSkraba/beam,josauder/AOP_incubator_beam,dhalperi/beam,josauder/AOP_incubator_beam,staslev/beam,staslev/incubator-beam,rangadi/incubator-beam,rangadi/incubator-beam,staslev/beam,amitsela/beam,tweise/incubator-beam,tgroh/beam,peihe/DataflowJavaSDK,jbonofre/incubator-beam,amitsela/incubator-beam,sammcveety/incubator-beam,charlesccychen/incubator-beam,ravwojdyla/incubator-beam,vikkyrk/incubator-beam,apache/beam,rangadi/beam,jbonofre/beam