THRIFT-1985: Add a Vagrantfile to build and test Apache Thrift fully reproducable

Moved the Vagrantfile to the contrib/ directory to prevent polluting the top level directory
diff --git a/.gitignore b/.gitignore
index 8c4ba8e..b9c63dc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,7 +23,7 @@
 
 /Makefile
 /Makefile.in
-/.vagrant/
+/contrib/.vagrant/
 /aclocal/libtool.m4
 /aclocal/ltoptions.m4
 /aclocal/ltsugar.m4