Add switcher for common directory

To migrate common directory for rst files from common-rst to common,
Add a switcher for common directory as a temporary trick.
When find a rst file in common directory,
we use "common" directory as priority.
This switcher will be removed after all migration works finish.

Change-Id: I7ba517136807513f982e66010906b97621f844fc

bin/doc-tools-build-rst

@@ -67,7 +67,13 @@ done
 
 if [ "$GLOSSARY" -eq "1" ] ; then
     echo "Generating Glossary"
-    tools/glossary2rst.py doc/common-rst/glossary.rst
+    # Use "common" directory as common if exists while migration
+    if [[ -e doc/common/conventions.rst ]] ; then
+        COMMON="common"
+    else
+        COMMON="common-rst"
+    fi
+    tools/glossary2rst.py doc/${COMMON}/glossary.rst
 fi
 
 if [ -z "$BUILD" ] ; then

bin/doc-tools-check-languages

@@ -57,16 +57,25 @@ function build_rst {
     if [ ${book} = "install-guide" ] ; then
         TAG="-t obs -t rdo -t ubuntu -t debian"
     fi
+
+    # Use "common" directory as common if exists while migration
+    if [[ -e ${DOC_DIR}common/conventions.rst ]] ; then
+        COMMON="common"
+    else
+        COMMON="common-rst"
+    fi
     LOCALE_DIR="${DOC_DIR}${book}/source/locale/"
-    COMMON_DIR="${DOC_DIR}common-rst/source/locale/"
+    COMMON_DIR="${DOC_DIR}${COMMON}/source/locale/"
+
     tox -evenv "sphinx-build -j $NUMBER_OF_CORES -q -E -W -b gettext $TAG \
                 ${DOC_DIR}${book}/source/ ${LOCALE_DIR}"
 
+
     # Merge the common-rst po file in
-    if [[ -e ${COMMON_DIR}${language}/LC_MESSAGES/common-rst.po ]] ; then
+    if [[ -e ${COMMON_DIR}${language}/LC_MESSAGES/${COMMON}.po ]] ; then
         msgcat --use-first -o ${LOCALE_DIR}${language}/${book}.po \
             ${LOCALE_DIR}${language}/LC_MESSAGES/${book}.po \
-            ${COMMON_DIR}${language}/LC_MESSAGES/common-rst.po
+            ${COMMON_DIR}${language}/LC_MESSAGES/${COMMON}.po
         mv -f ${LOCALE_DIR}${language}/${book}.po \
             ${LOCALE_DIR}${language}/LC_MESSAGES/${book}.po
     fi