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.

man/systemd-measure.xml

@@ -240,7 +240,7 @@
      --bank=sha1 \
      --bank=sha256 \
      --private-key=tpm2-pcr-private.pem \
-     --public-key=tpm2-pcr-public.pem > tpm2-pcr-signature.json
+     --public-key=tpm2-pcr-public.pem >tpm2-pcr-signature.json
 # ukify --output foo.efi \
      --os-release @os-release.txt \
      --cmdline @cmdline.txt \