[zsh/bash-completion] Avoid caret expansion

Close #233

setopt extendedglob on zsh caused caret in grep pattern to be expanded.
Problem identified and patch submitted by @lazywei.

shell/completion.bash

@@ -189,7 +189,7 @@ EOF
 
 _fzf_ssh_completion() {
   _fzf_list_completion '+m' "$@" << "EOF"
-    cat <(cat ~/.ssh/config /etc/ssh/ssh_config 2> /dev/null | \grep -i ^host | \grep -v '*') <(\grep -v '^\s*\(#\|$\)' /etc/hosts | \grep -Fv '0.0.0.0') | awk '{if (length($2) > 0) {print $2}}' | sort -u
+    cat <(cat ~/.ssh/config /etc/ssh/ssh_config 2> /dev/null | \grep -i '^host' | \grep -v '*') <(\grep -v '^\s*\(#\|$\)' /etc/hosts | \grep -Fv '0.0.0.0') | awk '{if (length($2) > 0) {print $2}}' | sort -u
 EOF
 }
 

shell/completion.zsh

@@ -82,7 +82,7 @@ EOF
 
 _fzf_ssh_completion() {
   _fzf_list_completion "$1" "$2" '+m' << "EOF"
-    cat <(cat ~/.ssh/config /etc/ssh/ssh_config 2> /dev/null | \grep -i ^host | \grep -v '*') <(\grep -v '^\s*\(#\|$\)' /etc/hosts | \grep -Fv '0.0.0.0') | awk '{if (length($2) > 0) {print $2}}' | sort -u
+    cat <(cat ~/.ssh/config /etc/ssh/ssh_config 2> /dev/null | \grep -i '^host' | \grep -v '*') <(\grep -v '^\s*\(#\|$\)' /etc/hosts | \grep -Fv '0.0.0.0') | awk '{if (length($2) > 0) {print $2}}' | sort -u
 EOF
 }