lsmem: new tool

lsmem: new tool

Move the s390 specific lsmem tool to util-linux.

The lsmem tool was originally written in perl and is part of the
s390-tools package which can be found here:
https://www.ibm.com/developerworks/linux/linux390/s390-tools.html

Given that the tool is architecture independent, there is no reason to
keep it in an s390 specific repository. It seems to be useful for
other architectures as well.

This patch converts the tool to C and adds it to util-linux, while the
command line options stay compatible. The only exception is the option
"-v" which used to be the short form of "--version". That got changed
to "-V" so it behaves like most other tools contained within
util-linux.

The lsmem tool inspect the contents of /sys/devices/system/memory and
prints a summary output similar to what lscpu does:

RANGE                                 SIZE STATE   REMOVABLE BLOCK
0x0000000000000000-0x000000005fffffff 1,5G online  yes       0-5
0x0000000060000000-0x000000007fffffff 512M online  no        6-7
0x0000000080000000-0x000000013fffffff   3G online  yes       8-19
0x0000000140000000-0x000000014fffffff 256M offline -         20
0x0000000150000000-0x000000017fffffff 768M online  no        21-23

Memory block size   :     256M
Total online memory :     5,8G
Total offline memory:     256M

In order to keep the output small the tool merges subsequent address
ranges where the attributes are identical. To avoid merging of line
the "-a" option can be used.

The lsmem tool also has "--extendend" and "--parsable" option which
can be used to customize the output, e.g.  limit the output to
specified columns. This is quite similar to what the lscpu tool does.

This is based on a patch from Clemens von Mann.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>