Fix tgtd.spec to build on SLES

The docbook package name is different between RedHat and SLES.

Signed-off-by: Roi Dayan <roid@mellanox.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
added support for bsoflags parameter

This patch will allow one to use bsoflags with tgt-admin.

Signed-off-by: Cédric Milesi <cedric.milesi@hp.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>