Merge pull request #18195 from mshabunin:linux-tutorial

Installation tutorials rework

* Doc: general installation, config reference, linux installation

* Doc: addressed review comments

* Minor fixes

samples/install/linux_verify.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+# This script verifies that all shell snippets in the
+# Linux installation tutorial work (in Ubuntu 18 container)
+set -e
+set -x
+
+SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null && pwd )"
+
+docker pull ubuntu:18.04
+
+for f in $(cd "${SCRIPT_DIR}" && ls -1 linux_*install*.sh) ; do
+    echo "Checking $f..."
+    docker run -it \
+        --volume "${SCRIPT_DIR}":/install:ro \
+        ubuntu:18.04 \
+        /bin/bash -ex /install/$f --check
+
+done