base-files: move hostname operations out of issue file settings

The function do_install_basefilesissue is meant to deal with
/etc/issue* files and the following setting could actually be
overridden.

  BASEFILESISSUEINSTALL ?= "do_install_basefilesissue"

So move the hostname operations out of this function.

(From OE-Core rev: f17bcc46341db5ee91bb26389ccaebc68c49b97e)

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

@@ -134,15 +134,16 @@ do_install () {
 	install -m 0644 ${WORKDIR}/motd ${D}${sysconfdir}/motd
 
 	ln -sf /proc/mounts ${D}${sysconfdir}/mtab
-}
 
-DISTRO_VERSION[vardepsexclude] += "DATE"
-do_install_basefilesissue () {
+	# deal with hostname
 	if [ "${hostname}" ]; then
 		echo ${hostname} > ${D}${sysconfdir}/hostname
 		echo "127.0.1.1 ${hostname}" >> ${D}${sysconfdir}/hosts
 	fi
+}
 
+DISTRO_VERSION[vardepsexclude] += "DATE"
+do_install_basefilesissue () {
 	install -m 644 ${WORKDIR}/issue*  ${D}${sysconfdir}
         if [ -n "${DISTRO_NAME}" ]; then
 		printf "${DISTRO_NAME} " >> ${D}${sysconfdir}/issue