build,script: Pin salt version in bootstrap and restore

In bootstrap and restore we install salt-minion on the node so we need
to pin the salt version we want to install and not just install the one
yum will find depending on various things (like available versions,
priority on repos, ...)

Fixes: #2704

buildchain/buildchain/iso.py

@@ -85,7 +85,10 @@
                 task_name='bootstrap.sh',
                 source=constants.ROOT/'scripts'/'bootstrap.sh.in',
                 destination=constants.ISO_ROOT/'bootstrap.sh',
-                context={'VERSION': versions.VERSION},
+                context={
+                    'VERSION': versions.VERSION,
+                    'SALT_VERSION': versions.SALT_VERSION
+                },
                 file_dep=[versions.VERSION_FILE],
                 task_dep=['_iso_mkdir_root'],
             ),
@@ -101,7 +104,10 @@
                 task_name='restore.sh',
                 source=constants.ROOT/'scripts'/'restore.sh.in',
                 destination=constants.ISO_ROOT/'restore.sh',
-                context={'VERSION': versions.VERSION},
+                context={
+                    'VERSION': versions.VERSION,
+                    'SALT_VERSION': versions.SALT_VERSION
+                },
                 file_dep=[versions.VERSION_FILE],
                 task_dep=['_iso_mkdir_root'],
             ),

scripts/bootstrap.sh.in

@@ -56,7 +56,7 @@ BASE_DIR=$(dirname "$(readlink -f "${BASH_SOURCE[0]}")")
 SALT_CALL=${SALT_CALL:-salt-call}
 
 declare -a PACKAGES=(
-    salt-minion
+    salt-minion-@@SALT_VERSION
     genisoimage
 )
 

scripts/restore.sh.in

@@ -70,7 +70,7 @@ BASE_DIR=$(dirname "$(readlink -f "${BASH_SOURCE[0]}")")
 SALT_CALL=${SALT_CALL:-salt-call}
 
 declare -a PACKAGES=(
-    salt-minion
+    salt-minion-@@SALT_VERSION
     genisoimage
 )