Support patterns in sshd_config

AllowUsers, DenyUsers, AllowGroups, DenyGroups should support
comma-separated list of patterns (man sshd_config, man ssh_config)

Change-Id: I889ae8027d036a174c5fec2713b0b0e3f9a3e544
diff --git a/.gitignore b/.gitignore
index aa8e42a..a1257c4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,7 @@
 .kitchen
+.bundle/
+*Gemfile/
+bundle/
 tests/build/
 *.swp
 *.pyc