`complete -d cd' does not work for dirs with a ' char

[Clark Wang]

See following example with bash-4.3.11:

[STEP 101] $ mkdir -p "foo's dir/dir1/dir2"
[STEP 102] $ complete -d cd
[STEP 103] $ cd <TAB>
[STEP 103] $ cd foo\'s\ dir/<TAB>

The 1st <TAB> worked fine but the 2nd failed to work. Bash 4.2.47 and 4.1.9
behaved the same.

-clark