CONFIG: add hostCollated for -fileHandler completion

- in anticipation of future change,
  hard-coded choice within bash_completion

etc/config.sh/bash_completion

@@ -2,7 +2,7 @@
 # =========                 |
 # \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
 #  \\    /   O peration     |
-#   \\  /    A nd           | Copyright (C) 2017 OpenCFD Ltd.
+#   \\  /    A nd           | Copyright (C) 2017-2018 OpenCFD Ltd.
 #    \\/     M anipulation  |
 #------------------------------------------------------------------------------
 # License
@@ -109,7 +109,7 @@ _of_complete_()
     local choices
 
     case ${prev} in
-    -help|-help-full|-doc|-doc-source)
+    -help | -help-full | -doc | -doc-source)
         # These options are usage - we can stop now.
         COMPREPLY=()
         return 0
@@ -126,7 +126,7 @@ _of_complete_()
         COMPREPLY=($(compgen -W "$choices" -- ${cur}))
         ;;
     -fileHandler)
-        choices="collated uncollated masterUncollated"
+        choices="collated uncollated hostCollated masterUncollated"
         COMPREPLY=($(compgen -W "$choices" -- ${cur}))
         ;;
     *)