test: drop whitespace after shell redirection operators

(The one case that is left unchanged is '< <(subcommand)'.)

This way, the style with no gap was already dominant. This way, the reader
immediately knows that ' < ' is a comparison operator and ' << ' is a shift.

In a few cases, replace custom EOF replacement by just EOF. There is no point
in using someting like "_EOL" unless "EOF" appears in the text.

test/units/testsuite-67.sh

@@ -29,9 +29,9 @@ trap cleanup EXIT
 
 build_integrity_tab()
 {
-cat << _EOL > "/etc/integritytab"
+cat <<EOF >"/etc/integritytab"
 ${DM_NAME} ${loop} - integrity-algorithm=$1
-_EOL
+EOF
 }
 
 image_dir="$(mktemp -d -t -p / integrity.tmp.XXXXXX)"

tools/update-hwdb-autosuspend.sh

@@ -7,11 +7,11 @@ cd "${1:?}"
 (curl --fail -L 'https://chromium.googlesource.com/chromiumos/platform2/+/master/power_manager/udev/gen_autosuspend_rules.py?format=TEXT'; echo) \
     | base64 -d >tools/chromiumos/gen_autosuspend_rules.py
 
-(cat <<%EOF
+(cat <<EOF
 # This file is part of systemd.
 #
 # Rules to autosuspend known fingerprint readers (pulled from libfprint).
 #
-%EOF
+EOF
 curl --fail -L 'https://gitlab.freedesktop.org/libfprint/libfprint/-/raw/master/data/autosuspend.hwdb') \
     >hwdb.d/60-autosuspend-fingerprint-reader.hwdb