feat: recognize disk partion 0 as a valid option

This adds support for running VM images using LVM file systems in
snapshot mode by skipping default disk injections but still allowing
minimega snapshots to be enabled.

Documentation has been added to the main phenix documentation for this
feature.

Author: activeshadow

src/go/tmpl/templates/minimega_script.tmpl

@@ -33,11 +33,13 @@ ns add-host localhost
         {{- if (derefBool .General.Snapshot) -}}
             {{ $firstDrive := index .Hardware.Drives 0 }}
 disk snapshot {{ $firstDrive.Image }} {{ $.SnapshotName .General.Hostname }}
-            {{- if gt (len .Injections) 0 }}
+            {{- if ne $firstDrive.GetInjectPartition 0 }}
+                {{- if gt (len .Injections) 0 }}
 disk inject {{ $.SnapshotName .General.Hostname }}:{{ $firstDrive.GetInjectPartition }} files {{ .FileInjects $basedir }}
-            {{- end }}
-            {{- if gt (len .Deletions) 0 }}
+                {{- end }}
+                {{- if gt (len .Deletions) 0 }}
 disk inject {{ $.SnapshotName .General.Hostname }}:{{ $firstDrive.GetInjectPartition }} delete files {{ .FileDeletions }}
+                {{- end }}
             {{- end }}
         {{- end }}
 clear vm config