Remove the nonexistent install-guide directory

Since we have no install-guide directory, So remove thing related
to that.

Change-Id: Id946d4e55455e94ea3f1bc4697fd9e3a64b832a0

.gitignore

@@ -41,9 +41,6 @@ api-ref/build
 # Files created by releasenotes build
 releasenotes/build
 
-# Files created by install-guide builds
-install-guide/build
-
 # Development environment files
 .project
 .pydevproject

.zuul.yaml

@@ -51,7 +51,6 @@
       - ^.*\.rst$
       - ^api-ref/.*$
       - ^doc/.*$
-      - ^install-guide/.*$
       - ^manila/hacking/.*$
       - ^manila/tests/.*$
       - ^releasenotes/.*$
@@ -73,7 +72,6 @@
       - ^.*\.rst$
       - ^api-ref/.*$
       - ^doc/.*$
-      - ^install-guide/.*$
       - ^manila/hacking/.*$
       - ^manila/tests/.*$
       - ^releasenotes/.*$
@@ -372,7 +370,6 @@
       - ^.*\.rst$
       - ^api-ref/.*$
       - ^doc/.*$
-      - ^install-guide/.*$
       - ^manila/hacking/.*$
       - ^manila/tests/.*$
       - ^releasenotes/.*$
@@ -395,7 +392,6 @@
       - ^.*\.rst$
       - ^api-ref/.*$
       - ^doc/.*$
-      - ^install-guide/.*$
       - ^manila/hacking/.*$
       - ^manila/tests/.*$
       - ^releasenotes/.*$