[vagrant] Use macro where possible.

[Vít Ondruch]

commit 7aee8d4f2e330e09ecf7c2ae9b9035d79f5cf937
Author: Vít Ondruch <vondruch at redhat.com>
Date:   Wed Nov 26 11:53:32 2014 +0100

    Use macro where possible.

 vagrant.spec |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/vagrant.spec b/vagrant.spec
index 1fe509c..7c233a5 100644
--- a/vagrant.spec
+++ b/vagrant.spec
@@ -106,7 +106,7 @@ install -D -m 0644 %{buildroot}%{vagrant_dir}/contrib/bash/completion.sh \
   %{buildroot}%{bashcompletion_dir}/%{name}
 
 # create the global home dir
-install -d -m 755 %{buildroot}%{_sharedstatedir}/%{name}
+install -d -m 755 %{buildroot}%{vagrant_plugin_dir}
 
 %check
 # Unpack the vagran-spec and adjust the directory name.