base-files: respect VOLATILE_LOG_DIR

Respect VOLATILE_LOG_DIR variable. In this way, if the user overrides
this variable to be any valid boolean false value, /var/log on the final
image would reside on persistent storage.

[YOCTO #6132]

(From OE-Core rev: fc19114ca409fc3178ae5cbb44db875b12eeedfc)

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/base-files/base-files_3.0.14.bb

@@ -42,7 +42,7 @@ dirs755 = "/boot /dev ${base_bindir} ${base_sbindir} ${base_libdir} \
            ${localstatedir}/backups ${localstatedir}/lib \
            /sys ${localstatedir}/lib/misc ${localstatedir}/spool \
            ${localstatedir}/volatile \
-           ${localstatedir}/volatile/log \
+           ${localstatedir}/${@'volatile/' if oe.types.boolean('${VOLATILE_LOG_DIR}') else ''}log \
            /home ${prefix}/src ${localstatedir}/local \
            /media"
 
@@ -53,7 +53,7 @@ dirs755-lsb = "/srv  \
                ${prefix}/lib/locale"
 dirs2775-lsb = "/var/mail"
 
-volatiles = "log tmp"
+volatiles = "${@'log' if oe.types.boolean('${VOLATILE_LOG_DIR}') else ''} tmp"
 conffiles = "${sysconfdir}/debian_version ${sysconfdir}/host.conf \
              ${sysconfdir}/issue /${sysconfdir}/issue.net \
              ${sysconfdir}/nsswitch.conf ${sysconfdir}/profile \