strbuf: introduce strbuf_getline_{lf,nul}()

The strbuf_getline() interface allows a byte other than LF or NUL as
the line terminator, but this is only because I wrote these
codepaths anticipating that there might be a value other than NUL
and LF that could be useful when I introduced line_termination long
time ago.  No useful caller that uses other value has emerged.

By now, it is clear that the interface is overly broad without a
good reason.  Many codepaths have hardcoded preference to read
either LF terminated or NUL terminated records from their input, and
then call strbuf_getline() with LF or NUL as the third parameter.

This step introduces two thin wrappers around strbuf_getline(),
namely, strbuf_getline_lf() and strbuf_getline_nul(), and
mechanically rewrites these call sites to call either one of
them.  The changes contained in this patch are:

 * introduction of these two functions in strbuf.[ch]

 * mechanical conversion of all callers to strbuf_getline() with
   either '\n' or '\0' as the third parameter to instead call the
   respective thin wrapper.

After this step, output from "git grep 'strbuf_getline('" would
become a lot smaller.  An interim goal of this series is to make
this an empty set, so that we can have strbuf_getline_crlf() take
over the shorter name strbuf_getline().

Signed-off-by: Junio C Hamano <gitster@pobox.com>

remote-testsvn.c

@@ -154,7 +154,7 @@ static void check_or_regenerate_marks(int latestrev)
 		fclose(marksfile);
 	} else {
 		strbuf_addf(&sb, ":%d ", latestrev);
-		while (strbuf_getline(&line, marksfile, '\n') != EOF) {
+		while (strbuf_getline_lf(&line, marksfile) != EOF) {
 			if (starts_with(line.buf, sb.buf)) {
 				found++;
 				break;
@@ -322,7 +322,7 @@ int main(int argc, char **argv)
 	marksfilename = marksfilename_sb.buf;
 
 	while (1) {
-		if (strbuf_getline(&buf, stdin, '\n') == EOF) {
+		if (strbuf_getline_lf(&buf, stdin) == EOF) {
 			if (ferror(stdin))
 				die("Error reading command stream");
 			else