Replace /etc/machine-id with an empty file

Since these images can be used to create multiple machines, they should
not have a unique machine-id attached to them. Replace /etc/machine-id
with an empty file so that it will be regenerated at boot time.

(cherry picked from commit 6fab72d894)

Related: rhbz#1656105

share/composer/ami.ks

@@ -33,6 +33,10 @@ services --enabled=sshd,chronyd,cloud-init
 # Remove random-seed
 rm /var/lib/systemd/random-seed
 
+# Clear /etc/machine-id
+rm /etc/machine-id
+touch /etc/machine-id
+
 # tell cloud-init to create the ec2-user account
 sed -i 's/cloud-user/ec2-user/' /etc/cloud/cloud.cfg
 %end

share/composer/ext4-filesystem.ks

@@ -24,6 +24,10 @@ bootloader --location=none
 %post
 # Remove random-seed
 rm /var/lib/systemd/random-seed
+
+# Clear /etc/machine-id
+rm /etc/machine-id
+touch /etc/machine-id
 %end
 
 %packages --nobase

share/composer/partitioned-disk.ks

@@ -26,6 +26,10 @@ zerombr
 %post
 # Remove random-seed
 rm /var/lib/systemd/random-seed
+
+# Clear /etc/machine-id
+rm /etc/machine-id
+touch /etc/machine-id
 %end
 
 %packages

share/composer/qcow2.ks

@@ -26,6 +26,10 @@ zerombr
 %post
 # Remove random-seed
 rm /var/lib/systemd/random-seed
+
+# Clear /etc/machine-id
+rm /etc/machine-id
+touch /etc/machine-id
 %end
 
 %packages

share/composer/tar.ks

@@ -24,6 +24,10 @@ bootloader --location=none
 %post
 # Remove random-seed
 rm /var/lib/systemd/random-seed
+
+# Clear /etc/machine-id
+rm /etc/machine-id
+touch /etc/machine-id
 %end
 
 # NOTE Do NOT add any other sections after %packages

share/composer/vhd.ks

@@ -31,6 +31,10 @@ services --enabled=sshd,chronyd,waagent
 # Remove random-seed
 rm /var/lib/systemd/random-seed
 
+# Clear /etc/machine-id
+rm /etc/machine-id
+touch /etc/machine-id
+
 # This file is required by waagent in RHEL, but compatible with NetworkManager
 cat > /etc/sysconfig/network-scripts/ifcfg-eth0 << EOF
 DEVICE=eth0

share/composer/vmdk.ks

@@ -27,6 +27,10 @@ services --enabled=sshd,chronyd,vmtoolsd
 %post
 # Remove random-seed
 rm /var/lib/systemd/random-seed
+
+# Clear /etc/machine-id
+rm /etc/machine-id
+touch /etc/machine-id
 %end
 
 %packages