Backport arch and centos fixes into deploy bootstrap

salt/cloud/deploy/bootstrap-salt.sh

@@ -2577,6 +2577,7 @@ install_centos_stable_deps() {
     __install_epel_repository || return 1
 
     if [ "$_ENABLE_EXTERNAL_ZMQ_REPOS" -eq $BS_TRUE ]; then
+        yum -y install python-hashlib || return 1
         __install_saltstack_copr_zeromq_repository || return 1
     fi
 
@@ -3369,6 +3370,8 @@ install_amazon_linux_ami_testing_post() {
 #
 install_arch_linux_stable_deps() {
 
+    pacman-db-upgrade
+
     if [ ! -f /etc/pacman.d/gnupg ]; then
         pacman-key --init && pacman-key --populate archlinux || return 1
     fi