MT#55942 tt2-process: Move YAML config existence check from callers

For multi-site support we need to pass all the possible files to load,
and these might be different between sites, so we need to check for
their existence from within tt2-process, instead of from the outside as
that would restrict them to only the current site.

Change-Id: I0965506832aa2f0a1ba67b19511c509bec60922e

helper/tt2-process

@@ -422,6 +422,8 @@ sub merge_yml {
     return $config if exists $loaded_ymls{$file};
     $loaded_ymls{$file} = undef;
 
+    return $config if not -f $file;
+
     my $prefix = output_prefix();
     print "$prefix: Loading $file in memory:" unless $options{quiet};
     my $hm = Hash::Merge->new('RIGHT_PRECEDENT');

scripts/build

@@ -44,9 +44,7 @@ if [ -n "${NGCP_JOBS:-}" ] ; then
 fi
 
 for f in ${NGCPCTL_CONFIG:-} ${NODE_CONFIG:-} ${PAIR_CONFIG:-} ${HOST_CONFIG:-} ${LOCAL_CONFIG:-} ${MAINTENANCE_CONFIG:-} ${NETWORK_CONFIG:-} "${EXTRA_CONFIG_FILES[@]}" ${CONSTANTS_CONFIG:-} ; do
-  if [ -r "$f" ] ; then
-    ARGS+=("-c" "$f")
-  fi
+  ARGS+=("-c" "$f")
 done
 
 build_config_files_instances() {

scripts/get

@@ -47,9 +47,7 @@ fi
 # Get the list of configs in proper order to load.
 declare -a ARGS
 for f in ${NGCPCTL_CONFIG:-} ${NODE_CONFIG:-} ${PAIR_CONFIG:-} ${HOST_CONFIG:-} ${LOCAL_CONFIG:-} ${MAINTENANCE_CONFIG:-} ${NETWORK_CONFIG:-} "${EXTRA_CONFIG_FILES[@]}" ${CONSTANTS_CONFIG:-} ; do
-  if [ -r "$f" ] ; then
-    ARGS+=("-c" "${f}")
-  fi
+  ARGS+=("-c" "${f}")
 done
 
 # main script