Scale Vagrant machine VCPU use back to 1
Scale Vagrant machine VCPU use back to 1

This code was borrowed from a machine used to compile the Linux kernel, and is
an excessive use of resources when not necessary as @conorsch pointed out in
https://github.com/freedomofpress/securedrop/pull/1561#pullrequestreview-20336464.

conorsch/securedrop,ehartsuyker/securedrop,conorsch/securedrop,garrettr/securedrop,garrettr/securedrop,ageis/securedrop,ehartsuyker/securedrop,heartsucker/securedrop,garrettr/securedrop,heartsucker/securedrop,garrettr/securedrop,ageis/securedrop,conorsch/securedrop,ageis/securedrop,ehartsuyker/securedrop,ehartsuyker/securedrop,micahflee/securedrop,conorsch/securedrop,ageis/securedrop,heartsucker/securedrop,micahflee/securedrop,heartsucker/securedrop,ehartsuyker/securedrop,ehartsuyker/securedrop,conorsch/securedrop,micahflee/securedrop,micahflee/securedrop,heartsucker/securedrop