base-files: fix up misleading dir grouping names for lsb dirs

In commit b0df35f47f
("base-files: Add to make some directories needed by LSB.") there
were new groupings of dirs made.  But rather than keep the grouping
names permissions based as they clearly were, it seems that it was
unfortunately misinterpreted as a counter, simply incrementing as
a new group was added.

This leads to dir3755 getting chmod'd to 0755 and dir4775 being
chmod'd to 2775 which to any new reader of the code is terribly
confusing.

Choose names that clearly reflect the permissions, and add a lsb
suffix to indicate the role.

Also note that the settings for /var/mail seem incorrect, and so
they have been aligned with what is seen in most common distros.

(From OE-Core rev: 5cba414e3fd7dbe761a6f628c6a368a412c0cba3)

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/files/fs-perms.txt

@@ -60,8 +60,8 @@ ${localstatedir}/local		0755	root	root	false - - -
 /tmp				01777	root	root	false - - -
 ${localstatedir}/volatile/tmp	01777	root	root	false - - -
 
-# Set 3755
+# Set 755-lsb
 /srv				0755	root	root	false - - -
 
-# Set 4775
-/var/mail			02755	root	root	false - - -
+# Set 2775-lsb
+/var/mail			02775	root	mail	false - - -

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

@@ -45,12 +45,13 @@ dirs755 = "/bin /boot /dev ${sysconfdir} ${sysconfdir}/default \
            ${localstatedir}/volatile/log \
            /home ${prefix}/src ${localstatedir}/local \
            /media"
-dirs3755 = "/srv  \
-            ${prefix}/local ${prefix}/local/bin ${prefix}/local/games \
-            ${prefix}/local/include ${prefix}/local/lib ${prefix}/local/sbin \
-            ${prefix}/local/share ${prefix}/local/src \
-            ${prefix}/lib/locale"
-dirs4775 = "/var/mail"
+
+dirs755-lsb = "/srv  \
+               ${prefix}/local ${prefix}/local/bin ${prefix}/local/games \
+               ${prefix}/local/include ${prefix}/local/lib ${prefix}/local/sbin \
+               ${prefix}/local/share ${prefix}/local/src \
+               ${prefix}/lib/locale"
+dirs2775-lsb = "/var/mail"
 
 volatiles = "log tmp"
 conffiles = "${sysconfdir}/debian_version ${sysconfdir}/host.conf \
@@ -130,12 +131,12 @@ do_install_basefilesissue () {
 }
 
 do_install_append_linuxstdbase() {
-	for d in ${dirs3755}; do
+	for d in ${dirs755-lsb}; do
                 install -m 0755 -d ${D}$d
         done
 
-	for d in ${dirs4775}; do
-                install -m 2755 -d ${D}$d
+	for d in ${dirs2775-lsb}; do
+                install -m 2775 -d ${D}$d
         done
 }