increase RAM and CPU cores for Vagrant template

reduce RAM for Vagrant VMs used to run tests

build packages with multiple threads

refs #4382

Change-Id: I30ad59a6e705bafa60f5680f725b528bac5f9833
diff --git a/.gitignore b/.gitignore
index 986f9d6..0bb0587 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,8 +1,10 @@
 *.pyc
 *.pyo
+/.vagrant/
 /install_helpers/tools/generate-link-object
 /install_helpers/tools/test-nack-consumer
 /install_helpers/tools/test-nexthopfaceid-consumer
+/nfd-integ.box
 /temp/
 /test_interest_loop/keys/
 logs/