contrib/rpm: disable rp_filter in config-connectivity-redhat

RHEL ships with a rp_filter and can't change that for historic reasons.
That's unfortunate, because it breaks the connectivity checking. Let's
override it if the connectivity checking package is installed.

!185
20 jobs for master in 42 minutes and 59 seconds (queued for 418 minutes and 54 seconds)
Status Job ID Name Coverage
  Test
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checkpatch

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manual #422358
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t_centos:7.5.1804
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t_centos:7.6.1810

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passed #422365
t_debian:10

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passed #422364
t_debian:9

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passed #422367
t_debian:sid

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manual #422366
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t_debian:testing
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t_fedora:28

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t_fedora:29

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t_fedora:rawhide
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t_ubuntu:16.04

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t_ubuntu:18.04

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manual #422363
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t_ubuntu:devel
manual #422362
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t_ubuntu:rolling
 
  Deploy
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pages

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failed pages:deploy

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failed pages:deploy

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