[image-guide] build Image Guide PDF

To avoid building error derived from UTF-8 characters,
this patch changed them to ascii characters.

Change-Id: I1905e2646579b7f4b25fef1867b9a9ea12863ef3
Implements: blueprint build-pdf-from-rst-guides

doc/image-guide/source/modify-images.rst

@@ -256,9 +256,9 @@ resize to 50 GB.
       **********
       Setting up initial partition table on /data/images/win2012-50gb.qcow2 ...
       Copying /dev/sda1 ...
-       100% ⟦▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓⟧ 00:00
+       100% [                                                                 ] 00:00
       Copying /dev/sda2 ...
-       100% ⟦▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓⟧ 00:00
+       100% [                                                                 ] 00:00
       Expanding /dev/sda2 using the 'ntfsresize' method ...
 
       Resize operation completed with no errors. Before deleting the old

tools/build-all-rst.sh

@@ -22,7 +22,7 @@ PDF_OPTION="--pdf"
 
 # PDF targets for Install guides are dealt in build-install-guides-rst.sh
 PDF_TARGETS=( 'arch-design' 'arch-design-draft' 'cli-reference'\
-              'ha-guide' 'networking-guide'\
+              'ha-guide' 'image-guide' 'networking-guide'\
               'ops-guide' 'user-guide' )
 
 # Note that these guides are only build for master branch