Add testing for Linux distribution detection

src/steps/os/os_release/antergos

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+NAME="Antergos Linux"
+VERSION="18.7-ISO-Rolling"
+ID="antergos"
+ID_LIKE="arch"
+PRETTY_NAME="Antergos Linux"
+CPE_NAME="cpe:/o:antergosproject:antergos:18.7"
+ANSI_COLOR="1;34;40"
+HOME_URL="antergos.com"
+SUPPORT_URL="forum.antergos.com"
+BUG_REPORT_URL="@antergos"

src/steps/os/os_release/arch

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+NAME="Arch Linux"
+PRETTY_NAME="Arch Linux"
+ID=arch
+BUILD_ID=rolling
+ANSI_COLOR="0;36"
+HOME_URL="https://www.archlinux.org/"
+DOCUMENTATION_URL="https://wiki.archlinux.org/"
+SUPPORT_URL="https://bbs.archlinux.org/"
+BUG_REPORT_URL="https://bugs.archlinux.org/"

src/steps/os/os_release/centos

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+NAME="CentOS Linux"
+VERSION="7 (Core)"
+ID="centos"
+ID_LIKE="rhel fedora"
+VERSION_ID="7"
+PRETTY_NAME="CentOS Linux 7 (Core)"
+ANSI_COLOR="0;31"
+CPE_NAME="cpe:/o:centos:centos:7"
+HOME_URL="https://www.centos.org/"
+BUG_REPORT_URL="https://bugs.centos.org/"
+
+CENTOS_MANTISBT_PROJECT="CentOS-7"
+CENTOS_MANTISBT_PROJECT_VERSION="7"
+REDHAT_SUPPORT_PRODUCT="centos"
+REDHAT_SUPPORT_PRODUCT_VERSION="7"
+

src/steps/os/os_release/debian

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+PRETTY_NAME="Debian GNU/Linux 8 (jessie)"
+NAME="Debian GNU/Linux"
+VERSION_ID="8"
+VERSION="8 (jessie)"
+ID=debian
+HOME_URL="http://www.debian.org/"
+SUPPORT_URL="http://www.debian.org/support"
+BUG_REPORT_URL="https://bugs.debian.org/"

src/steps/os/os_release/fedora

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+NAME=Fedora
+VERSION="29 (Container Image)"
+ID=fedora
+VERSION_ID=29
+VERSION_CODENAME=""
+PLATFORM_ID="platform:f29"
+PRETTY_NAME="Fedora 29 (Container Image)"
+ANSI_COLOR="0;34"
+LOGO=fedora-logo-icon
+CPE_NAME="cpe:/o:fedoraproject:fedora:29"
+HOME_URL="https://fedoraproject.org/"
+DOCUMENTATION_URL="https://docs.fedoraproject.org/en-US/fedora/f29/system-administrators-guide/"
+SUPPORT_URL="https://fedoraproject.org/wiki/Communicating_and_getting_help"
+BUG_REPORT_URL="https://bugzilla.redhat.com/"
+REDHAT_BUGZILLA_PRODUCT="Fedora"
+REDHAT_BUGZILLA_PRODUCT_VERSION=29
+REDHAT_SUPPORT_PRODUCT="Fedora"
+REDHAT_SUPPORT_PRODUCT_VERSION=29
+PRIVACY_POLICY_URL="https://fedoraproject.org/wiki/Legal:PrivacyPolicy"
+VARIANT="Container Image"
+VARIANT_ID=container

src/steps/os/os_release/mint

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+NAME="Linux Mint"
+VERSION="18.2 (Sonya)"
+ID=linuxmint
+ID_LIKE=ubuntu
+PRETTY_NAME="Linux Mint 18.2"
+VERSION_ID="18.2"
+HOME_URL="http://www.linuxmint.com/"
+SUPPORT_URL="http://forums.linuxmint.com/"
+BUG_REPORT_URL="http://bugs.launchpad.net/linuxmint/"
+VERSION_CODENAME=sonya
+UBUNTU_CODENAME=xenial

src/steps/os/os_release/opensuse

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+NAME="openSUSE Leap"
+VERSION="42.3"
+ID=opensuse
+ID_LIKE="suse"
+VERSION_ID="42.3"
+PRETTY_NAME="openSUSE Leap 42.3"
+ANSI_COLOR="0;32"
+CPE_NAME="cpe:/o:opensuse:leap:42.3"
+BUG_REPORT_URL="https://bugs.opensuse.org"
+HOME_URL="https://www.opensuse.org/"

src/steps/os/os_release/oracle

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+NAME="Oracle Linux Server"
+VERSION="7.6"
+ID="ol"
+VARIANT="Server"
+VARIANT_ID="server"
+VERSION_ID="7.6"
+PRETTY_NAME="Oracle Linux Server 7.6"
+ANSI_COLOR="0;31"
+CPE_NAME="cpe:/o:oracle:linux:7:6:server"
+HOME_URL="https://linux.oracle.com/"
+BUG_REPORT_URL="https://bugzilla.oracle.com/"
+
+ORACLE_BUGZILLA_PRODUCT="Oracle Linux 7"
+ORACLE_BUGZILLA_PRODUCT_VERSION=7.6
+ORACLE_SUPPORT_PRODUCT="Oracle Linux"
+ORACLE_SUPPORT_PRODUCT_VERSION=7.6

src/steps/os/os_release/ubuntu

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+NAME="Ubuntu"
+VERSION="18.04.2 LTS (Bionic Beaver)"
+ID=ubuntu
+ID_LIKE=debian
+PRETTY_NAME="Ubuntu 18.04.2 LTS"
+VERSION_ID="18.04"
+HOME_URL="https://www.ubuntu.com/"
+SUPPORT_URL="https://help.ubuntu.com/"
+BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
+PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
+VERSION_CODENAME=bionic
+UBUNTU_CODENAME=bionic