LU-12214 build: fixes if the name is not just 'lustre'

LU-12214 build: fixes if the name is not just 'lustre'

fix using a %{name} macro in spec file.
this allow to have right names for server packages.

Cray-bug-id: LUS-5915
Test-parameters: trivial
Change-Id: I2ae271b5344fb899bb053f82d2534355ce60aa3a
Signed-off-by: Alexey Lyashkov <c17817@cray.com>
Reviewed-on: https://review.whamcloud.com/36424
Reviewed-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Alexander Boyko <c17825@cray.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>