Libevent: Used `evutil_gettimeofday` to implement `time()`.
Libevent: Used `evutil_gettimeofday` to implement `time()`.

This used to be implemented by `event_base_gettimeofday_cached()`. We
want to avoid cached results in case they introduce any issues.

Review: https://reviews.apache.org/r/37907

craimbert/mesos,craimbert/mesos,Aman-Jain-14/customizedMesos,verizonlabs/mesos,gsantovena/mesos,verizonlabs/mesos,jpeach/mesos,kaysoky/mesos,jpeach/mesos,yuquanshan/customizedMesos,jpeach/mesos,abudnik/mesos,gsantovena/mesos,Gilbert88/mesos,Aman-Jain-14/customizedMesos,Aman-Jain-14/customizedMesos,yuquanshan/customizedMesos,abudnik/mesos,asamerh4/mesos,gsantovena/mesos,asamerh4/mesos,verizonlabs/mesos,abudnik/mesos,verizonlabs/mesos,zmalik/mesos,abudnik/mesos,reneploetz/mesos,Gilbert88/mesos,Aman-Jain-14/customizedMesos,zmalik/mesos,yuquanshan/customizedMesos,chhsia0/mesos,craimbert/mesos,verizonlabs/mesos,craimbert/mesos,asamerh4/mesos,Aman-Jain-14/customizedMesos,gsantovena/mesos,jpeach/mesos,chhsia0/mesos,craimbert/mesos,abudnik/mesos,kaysoky/mesos,andschwa/mesos,dforsyth/mesos,neilconway/mesos,andschwa/mesos,kaysoky/mesos,reneploetz/mesos,zmalik/mesos,dforsyth/mesos,verizonlabs/mesos,craimbert/mesos,Gilbert88/mesos,abudnik/mesos,chhsia0/mesos,dforsyth/mesos,jpeach/mesos,gsantovena/mesos,kaysoky/mesos,yuquanshan/customizedMesos,asamerh4/mesos,asamerh4/mesos,dforsyth/mesos,reneploetz/mesos,chhsia0/mesos,abudnik/mesos,reneploetz/mesos,Aman-Jain-14/customizedMesos,jpeach/mesos,chhsia0/mesos,gsantovena/mesos,andschwa/mesos,dforsyth/mesos,Gilbert88/mesos,reneploetz/mesos,Gilbert88/mesos,reneploetz/mesos,kaysoky/mesos,Gilbert88/mesos,jpeach/mesos,reneploetz/mesos,andschwa/mesos,zmalik/mesos,andschwa/mesos,Aman-Jain-14/customizedMesos,asamerh4/mesos,neilconway/mesos,zmalik/mesos,andschwa/mesos,yuquanshan/customizedMesos,asamerh4/mesos,yuquanshan/customizedMesos,Gilbert88/mesos,kaysoky/mesos,gsantovena/mesos,neilconway/mesos,verizonlabs/mesos,kaysoky/mesos,neilconway/mesos,dforsyth/mesos,chhsia0/mesos,dforsyth/mesos,andschwa/mesos,neilconway/mesos,neilconway/mesos,yuquanshan/customizedMesos,neilconway/mesos,zmalik/mesos,craimbert/mesos,zmalik/mesos,chhsia0/mesos