Fix completing multiple hosts (Debian: #535585)

Fixed `_known_hosts_real' to allow for multiple patterns in ssh config, e.g.:

    Host foo.example.net bar.example.net

IFS was set to just newline (\n), whereas `compgen -W' relies on IFS
being space-tab-newline ( \t\n) to expand hostnames which are separated
by whitespace.
Tests are updated as well (added host `jar' to config).  To run the tests:

    ./runUnit _known_hosts_real.exp

bash_completion

@@ -1069,7 +1069,6 @@ _known_hosts_real()
 	local configfile flag prefix
 	local cur curd awkcur user suffix aliases global_kh user_kh hosts i host
 	local -a kh khd config
-	local IFS=$'\n'
 
 	local OPTIND=1
 	while getopts "acF:p:" flag "$@"; do
@@ -1102,6 +1101,7 @@ _known_hosts_real()
 	fi
 
 	if [ ${#config[@]} -gt 0 ]; then
+		local OIFS=$IFS IFS=$'\n'
 		# expand path (if present) to global known hosts file
 		global_kh=($( sed -ne 's/^[ \t]*[Gg][Ll][Oo][Bb][Aa][Ll][Kk][Nn][Oo][Ww][Nn][Hh][Oo][Ss][Tt][Ss][Ff][Ii][Ll][Ee]['"$'\t '"']*\(.*\)$/\1/p' "${config[@]}" ))
 		for (( i=0; i < ${#global_kh[@]}; i++ )); do
@@ -1112,6 +1112,7 @@ _known_hosts_real()
 		for (( i=0; i < ${#user_kh[@]}; i++ )); do
 			user_kh[i]=$(echo "${user_kh[i]//\"/}")
 		done
+		IFS=$OIFS
 	fi
 
 	# Global known_hosts files

test/fixtures/_known_hosts_real/config

@@ -1,6 +1,6 @@
     UserKnownHostsFile fixtures/_known_hosts_real/known_hosts
 
     # Unindented
-Host gee
+Host gee jar
 	# Indented
     Host hus  # With comment

test/unit/_known_hosts_real.exp

@@ -13,9 +13,9 @@ setup
 
 set test "Hosts should be put in COMPREPLY"
 set hosts [get_hosts]
-    # Hosts `gee' and `hus' are defined in ./fixtures/_known_hosts_real/config
+    # Hosts `gee', `hus' and `jar' are defined in ./fixtures/_known_hosts_real/config
     # Hosts `doo' and `ike' are defined in ./fixtures/_known_hosts_real/known_hosts
-lappend hosts doo gee hus ike
+lappend hosts doo gee hus ike jar
 set hosts [lsort -ascii $hosts]
 set hosts [join $hosts "\\s+"]
     # Call _known_hosts