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LU-723 build: Enhance lustre/ldiskfs build system


Enhance the lustre/ldiskfs build system so it is more robust, flexible,
and consistent with lustre/zfs build system. This change is being made
in the interest of standardizing the infrastructure around backend
filesystems.

This change does not effect the current behavior of the --with-ldiskfs,
--enable-ext4, or --with-ldiskfsprogs configure options. However, it
does remove the obsolete --with-ldiskfs-inkernel configure option which
was only used by LLNL. It also adds the --with-ldiskfs-obj configure
option which improves flexibility. And the --enable-ldiskfs-build
configure option to support building against the lustre-ldiskfs-devel
package. The behavior of these options is consistent with their ZFS
counterparts, see commit 8c7266c for further details.

--enable-ext4 enable ldiskfs build using ext4
--enable-ldiskfs-build enable ldiskfs configure/make
--with-ldiskfs=path set path to ldiskfs source
--with-ldiskfs-obj=path set path to ldiskfs objects
--with-ldiskfsprogs use alternate names for ldiskfs-enabled e2fsprogs

Sample ./configure results when building lustre and ldiskfs using
the kernel-devel and kernel-debuginfo-common packages.

checking whether to enable ldiskfs... yes
checking ldiskfs source directory... /home/behlendo/src/git/lustre/ldiskfs
checking ldiskfs object directory... /home/behlendo/src/git/lustre/ldiskfs
checking ldiskfs module symbols... Module.symvers
checking ldiskfs source release... 3.3.0
checking whether to use ext3 or ext4 source... ext4
checking ext4 source directory... /usr/src/debug/.../fs/ext4
checking whether to build ldiskfs... yes
checking for /home/behlendo/src/git/lustre/ldiskfs/configure... yes
checking for /usr/src/debug/.../fs/ext4/dir.c... yes
checking for /usr/src/debug/.../fs/ext4/file.c... yes
checking for /usr/src/debug/.../fs/ext4/inode.c... yes
checking for /usr/src/debug/.../fs/ext4/super.c... yes
checking if ext4_ext_walk_space() takes i_data_sem... yes
checking if LDISKFS_SINGLEDATA_TRANS_BLOCKS takes sb as argument... yes
checking if ldiskfs_discard_preallocations defined... yes
checking if ldiskfs_ext_insert_extent needs 5 arguments... yes

In the context of this change additional cleanup has been done and
all of the ldiskfs specific code relocated to lustre-build-ldiskfs.m4.

Note that this change moves us closer to supporting patchless Lustre
servers with ldiskfs. Once the remaining kernel patches for Lustre
are dropped you will be able to build Lustre using the distribution
provided kernel-devel and kernel-debuginfo-common packages.

This change also incorporates ORI-340 commit f604951, which ensures
that the Module.symvers file will cleanly include the symbols for all
enabled Lustre backends. While the only backend supported by master
right now is ldiskfs this brings the master and orion branches into
sync in this regard.

Change-Id: I6f13f266944ec6967f4d7705a30b83ab8e577b15
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Prakash Surya <surya1@llnl.gov>