Fix typos in stackrc and unstack.sh

Componets => Components
pluggins => plugins

Change-Id: I82634a55fd5895599099c94817af7d8d2f602859
diff --git a/stackrc b/stackrc
index 156cb1f..05956ee 100644
--- a/stackrc
+++ b/stackrc
@@ -255,7 +255,7 @@
 
 ##############
 #
-#  OpenStack Client Library Componets
+#  OpenStack Client Library Components
 #
 ##############