Vagrantfile: Bump memory to 3G
Vagrantfile: Bump memory to 3G

I'm frequently seeing the following errors when running out of memory
with vagrant:

==> cilium-master: # github.com/cilium/cilium/daemon
==> cilium-master: /usr/local/go/pkg/tool/linux_amd64/link: running gcc failed: fork/exec /usr/bin/gcc: cannot allocate memory

Signed-off-by: Thomas Graf <5f50a84c1fa3bcff146405017f36aec1a10a9e38@cilium.io>

eloycoto/cilium,gumpt/cilium,mskarbek/cilium,gumpt/cilium,mskarbek/cilium,cilium-team/cilium,tgraf/cilium,tgraf/cilium,gumpt/cilium,tgraf/cilium,michi-covalent/cilium,mskarbek/cilium,tklauser/cilium,tklauser/cilium,michi-covalent/cilium,tklauser/cilium,eloycoto/cilium,cilium/cilium,eloycoto/cilium,michi-covalent/cilium,michi-covalent/cilium,mskarbek/cilium,cilium-team/cilium,eloycoto/cilium,mskarbek/cilium,gumpt/cilium,cilium/cilium,tgraf/cilium,mskarbek/cilium,cilium/cilium,cilium/cilium,eloycoto/cilium,tgraf/cilium,scanf/cilium,scanf/cilium,michi-covalent/cilium,scanf/cilium,gumpt/cilium,scanf/cilium,tklauser/cilium,scanf/cilium,eloycoto/cilium,gumpt/cilium,gumpt/cilium,scanf/cilium,scanf/cilium,eloycoto/cilium,tklauser/cilium,cilium/cilium,tgraf/cilium