Update Apt Support - Fixes #217

[AMDHome]

Apt requires users to run apt update to update the package list. Without this, there will never be any updates for apt upgrade to upgrade.

[AMDHome]

There are two changes in this PR:

1. Update apt package list during fact generation (The os_patching_fact_generation.sh does not run apt update #217). Apt requires users to run apt update to update the package list. Without this, there will never be any updates for apt upgrade to upgrade.

2. Different distros/repos can use different casing for the S in security (uppercase vs lowercase). awk is usually case sensitive which means depending on your distro, security apps could be marked as non-security related updates with this script. Making awk case insensitive resolves this issue.

For instance:
Debian (Capital S in Security):

root@amdhome-pve:~# apt upgrade -s 2>/dev/null | grep Inst | grep ecurity
Inst curl [7.64.0-4+deb10u2] (7.64.0-4+deb10u3 Debian-Security:10/oldstable [amd64]) []
Inst libcurl4 [7.64.0-4+deb10u2] (7.64.0-4+deb10u3 Debian-Security:10/oldstable [amd64])
Inst libcurl3-gnutls [7.64.0-4+deb10u2] (7.64.0-4+deb10u3 Debian-Security:10/oldstable [amd64])

Ubuntu (Lowercase s in security):

root@puppet-master:~# apt upgrade -s 2>/dev/null | grep Inst | grep ecurity
Inst curl [7.58.0-2ubuntu3.19] (7.58.0-2ubuntu3.20 Ubuntu:18.04/bionic-updates, Ubuntu:18.04/bionic-security [amd64]) []
Inst libcurl4 [7.58.0-2ubuntu3.19] (7.58.0-2ubuntu3.20 Ubuntu:18.04/bionic-updates, Ubuntu:18.04/bionic-security [amd64])
Inst libcurl3-gnutls [7.58.0-2ubuntu3.19] (7.58.0-2ubuntu3.20 Ubuntu:18.04/bionic-updates, Ubuntu:18.04/bionic-security [amd64])

The changes in the PR:
Debian:

root@amdhome-pve:~# apt upgrade -s 2>/dev/null | awk '$1 == "Inst" && /Security/ {print $2}'
curl
libcurl4
libcurl3-gnutls
root@amdhome-pve:~# apt upgrade -s 2>/dev/null | awk 'BEGIN {IGNORECASE = 1}; $1 == "Inst" && /Security/ {print $2}'
curl
libcurl4
libcurl3-gnutls

Ubuntu:

root@puppet-master:~# apt upgrade -s 2>/dev/null | awk '$1 == "Inst" && /Security/ {print $2}'
root@puppet-master:~# apt upgrade -s 2>/dev/null | awk 'BEGIN {IGNORECASE = 1}; $1 == "Inst" && /Security/ {print $2}'
curl
libcurl4
libcurl3-gnutls

[albatrossflavour]

Really well-documented PR. I've rebased it and merged it. Thanks