Branch b1_4_mountconf

Branch b1_4_mountconf
b=9846
add ability to change failover nodes or stripe params via lctl:
mgs> ./lctl conf_param lustre-OST0000 failnode=3@elan,192.168.0.3@tcp0
any client> cat /proc/fs/lustre/osc/lustre-OST0000-osc/ost_conn_uuid
mgs> ./lctl conf_param lustre-mdtlov default_stripe_size=1114112
mgs> ./lctl conf_param lustre-mdtlov default_stripe_count=2
mgs> ./lctl conf_param lustre-mdtlov default_stripe_offset=3
mgs> ./lctl conf_param lustre-mdtlov default_stripe_pattern=0
cat /proc/fs/lustre/lov/lustre-mdtlov/stripe*