replace mds1 with SINGLEMDS according to andreas advice

luster installed, which cause confusion of which lconf/lmc/lctl will be
used. We put $LUSTRE/utils and $LUSTRE/tests at the head of $PATH env
to ensure the tools in source tree will be searched at first. This should
not affect the tests by install, but if we got problem we'll back this
commit out.

- added IT_GETATTR to check if mount should be performed (experimental)

  - sleep_on() is known to be racy replacing it with OBD_SLEEP_ON()
  - added OBD_SLEEP_ON() which is inspired by wait_event() macro.
  - inter_module_{get|put}() replaced with symbol_{get|put}()

- fixes in GNS stuff:
  - ll_revalidate_it() calls missed ll_intent_release() in the case
    GNS dentry is found (fix for #6176)

  - added ll_gns_send_signal() which is needed to cause syscall restarting in the
    case of -ERESTARTSYS is returned.

  - cleanups in ll_gns_mount_object()

  - ll_gns_mount_object() does not wait unconditionaly for userspace upcall,
    instead it give it some time to complete (10s) and returns error if it
    did not mount dentry. This fixes the case when upcall script runs endless
    loop and never returns. This also fixes possible deadlock if another thread
    with wait on not finished mount (this schema is disabled by and -ERESTARTSYS
    is used instead. Both, waiting aproach and -ERESTARTSYS one need more
    investigation).

  - handling result of inode_setattr() call. Printing error message on error.
    This fixes wanings that result of calling this function should be checked.

  - fixed debug message about GNS inabilty to mount dentry (missed arg to CDEBUG
    format string)

  - cleanups in obdfilter_init()
  - fixed using "mount" command in sanity-gns.sh

some fix in replay-single.sh
b:6068

missing up in mds_open_by_id
b:6068

LiangZheng should already have a fix for this.

clean .depend files as well

Turn on D_CONFIG, D_CONSOLE, and D_IOCTL be default.

debug mask, I'm not python export but simply remove them fixed it.
b=6104

b=6244

 - clean more files at clean time

 - this is what i should have done originally

 - remove .flags files on make clean

 - nuke .flags files as well

 - add dependencies on built libs

     fixed bug in vibnal to do with mismatched RDMA fragments.  Manifest by
     lustre protocol errors when creating long symlinks so that the lustre
     request message size didn't fit in a vibnal immediate message (4K).

*    6010
     fix to prevent the LASSERT(0) in kqswnal_tx_done() if routing tables
     are set up incorrectly.

(Wrong tage list is initialized)

Reviewd by Wangdi.

by Nikita: fix group_info reference leak in pack_secdesc().

 - handle final completion calls only

 - add --disable-client and --disable-server configure options

 - added --disable-server and --disable-client configure options (5782)

r=adilger

 - move the lustre kernel modules to their own package
 - lbuild now does 'make rpms' to build lustre modules, more or less
 - pass --with-linux to lbuild to build only lustre rpms against an
   existing kernel source tree
 - drop the lustre-ldap rpm

  - more smart way to check if fs is mounted
  - in test 2g checking GNS with recursive path where last dir is not suid bit marked - should fail to mount it