ipfs-test-lib: fix test_fsh arg quoting

test_fsh() should quote its arguments before passing them to `eval` otherwise there are problems when the arguments contain spaces. For example when running the following program: ``` #!/bin/sh . ./ipfs-test-lib.sh die () { printf >&2 "%s\n" "$@" exit 1 } DIR1="test dir 1" DIR2="test dir 2" mkdir "$DIR1" "$DIR2" || die "Could not mkdir '$DIR1' '$DIR2'" echo "in dir 1" >"$DIR1/file1" || die "Could not write into '$DIR1/file1'" echo "in dir 2" >"$DIR2/file2" || die "Could not write into '$DIR2/file2'" if test_cmp "$DIR1/file1" "$DIR2/file2" then echo "test_cmp succeeded!" else echo "test_cmp failed!" fi rm -rf "$DIR1" "$DIR2" || die "Could not rm -rf '$DIR1' '$DIR2'" ``` we get: ``` > diff -u test dir 1/file1 test dir 2/file2 diff: extra operand '1/file1' diff: Try 'diff --help' for more information. test_cmp failed! ``` License: MIT Signed-off-by: Christian Couder <chriscool@tuxfamily.org>