dist/ami: update packer to 1.5.1

Update Packer to 1.5.1.
Needed to rename clean_ami_name -> clean_resource_name on scylla.json, since
the variable name had been changed.
Also fixed checksum verification code, trimmed unwanted extra strings
from sha256sum output.

dist/ami/build_ami.sh

@@ -194,16 +194,16 @@ if [ ! -f variables.json ]; then
 fi
 
 if [ ! -d packer ]; then
-    EXPECTED="5e51808299135fee7a2e664b09f401b5712b5ef18bd4bad5bc50f4dcd8b149a1  packer_1.3.2_linux_amd64.zip"
-    wget -nv https://releases.hashicorp.com/packer/1.3.2/packer_1.3.2_linux_amd64.zip -O packer_1.3.2_linux_amd64.zip
-    CSUM=`sha256sum packer_1.3.2_linux_amd64.zip`
+    EXPECTED="3305ede8886bc3fd83ec0640fb87418cc2a702b2cb1567b48c8cb9315e80047d"
+    wget -nv https://releases.hashicorp.com/packer/1.5.1/packer_1.5.1_linux_amd64.zip -O packer_1.5.1_linux_amd64.zip
+    CSUM=$(sha256sum packer_1.5.1_linux_amd64.zip|cut -d ' ' -f 1)
     if [ "$CSUM" != "$EXPECTED" ]; then
         echo "Error while downloading packer. Checksum doesn't match! ($CSUM)"
         exit 1
     fi
     mkdir packer
     cd packer
-    unzip -x ../packer_1.3.2_linux_amd64.zip
+    unzip -x ../packer_1.5.1_linux_amd64.zip
     cd -
 fi
 

dist/ami/scylla.json

@@ -36,7 +36,7 @@
           "virtual_name": "ephemeral7"
         }
       ],
-      "ami_name": "{{user `ami_prefix`}}scylla_{{isotime | clean_ami_name}}",
+      "ami_name": "{{user `ami_prefix`}}scylla_{{isotime | clean_resource_name}}",
       "associate_public_ip_address": "{{user `associate_public_ip_address`}}",
       "sriov_support": true,
       "ena_support": true,