sys-cluster/*: remove reference to proprietary resource managers

Signed-off-by: Alessandro Barbieri <lssndrbarbieri@gmail.com>

sys-cluster/spath/metadata.xml

@@ -13,7 +13,6 @@
 The spath libary defines a data structure and a number of functions to manipulate paths, including combining, slicing, simplification, computing relative paths, and converting to/from character strings.
   </longdescription>
   <use>
-    <flag name="lsf">Use LFS (Load Sharing Facility) as resource manager</flag>
     <flag name="slurm">Use <pkg>sys-cluster/slurm</pkg> as resource manager</flag>
   </use>
 </pkgmetadata>

sys-cluster/spath/spath-0.0.2.ebuild

@@ -12,7 +12,7 @@ SRC_URI="https://github.com/ECP-VeloC/${PN}/archive/v${PV}.tar.gz -> ${P}.tar.gz
 LICENSE="MIT"
 SLOT="0"
 KEYWORDS="~amd64"
-IUSE="lsf +mpi slurm test"
+IUSE="+mpi slurm test"
 
 #remove zlib in the next release (not used) https://github.com/ECP-VeloC/spath/issues/12
 RDEPEND="
@@ -28,13 +28,11 @@ DEPEND="
 PATCHES=( "${FILESDIR}/${P}-no-static.patch" )
 RESTRICT="!test? ( test )"
 REQUIRED_USE="
-	?? ( lsf slurm )
 	test? ( mpi )
 "
 
 src_configure() {
 	local vrm="NONE"
-	use lsf && vrm="LSF"
 	use slurm && vrm="SLURM"
 
 	local mycmakeargs=(