Restore default net.ipv4.ip_local_port_range
Restore default net.ipv4.ip_local_port_range

In 42930ed126ddba205996ab7f407819950d712862 we set
net.ipv4.ip_local_port_range to "10000 65535" to match the official
recommendations, however it overlaps with many testing ports, such as
15432, 25432, 20000, etc., until we have adjusted all of them to ports
below 10000 we would skip this setting.

Discussion: https://groups.google.com/a/greenplum.org/d/msg/gpdb-dev/fjF6OMzh2rQ/GbcmVvKlDAAJ

Reviewed-by: Jamie McAtamney <62a39b9671f8c44911ae4c7f4452af6da0c5d67e@pivotal.io>
Reviewed-by: Paul Guo <e78f8a884cebd97fb3b249dc32d233761d2e480a@pivotal.io>
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