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/install_helpers/install_repo.py b/install_helpers/install_repo.py
index 1307724..8748274 100644
--- a/install_helpers/install_repo.py
+++ b/install_helpers/install_repo.py
@@ -1,14 +1,13 @@
 #!/usr/bin/python2
 import os
 
-# Install ndn-tlv-ping
+# Install repo-ng
 def run():
     print "\nINSTALLING repo-ng"
     print "***********************"
     os.system("git clone --depth 1 https://github.com/named-data/repo-ng")
     os.chdir("repo-ng")
-    os.system("./waf distclean")
     os.system("./waf configure")
-    os.system("./waf -j1")
+    os.system("./waf")
     os.system("sudo ./waf install")
     os.chdir("..")