liboping: import from oldpackages, add myself as maintainer, add license information

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>
postgresql: import from oldpackages, add myself as maintainer, add license information, update to v9.0.17

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>
lm-sensors: import from oldpackages, add myself as maintainer, add license information, update to v3.3.5

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>
owfs: import from oldpackages, add myself as maintainer, add license information, update to v2.9p5

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>
net-snmp: import from oldpackages, add myself as maintainer, add license information, update to v5.4.4, refresh patches

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>