Rename formats-util.h to format-util.h

We don't have plural in the name of any other -util files and this
inconsistency trips me up every time I try to type this file name
from memory. "formats-util" is even hard to pronounce.

src/basic/cgroup-util.c

@@ -38,7 +38,7 @@
 #include "extract-word.h"
 #include "fd-util.h"
 #include "fileio.h"
-#include "formats-util.h"
+#include "format-util.h"
 #include "fs-util.h"
 #include "log.h"
 #include "login-util.h"

src/basic/log.c

@@ -37,7 +37,7 @@
 
 #include "alloc-util.h"
 #include "fd-util.h"
-#include "formats-util.h"
+#include "format-util.h"
 #include "io-util.h"
 #include "log.h"
 #include "macro.h"

src/basic/process-util.h

@@ -28,7 +28,7 @@
 #include <sys/types.h>
 #include <sys/resource.h>
 
-#include "formats-util.h"
+#include "format-util.h"
 #include "macro.h"
 
 #define procfs_file_alloca(pid, field)                                  \

src/basic/rlimit-util.c

@@ -22,7 +22,7 @@
 
 #include "alloc-util.h"
 #include "extract-word.h"
-#include "formats-util.h"
+#include "format-util.h"
 #include "macro.h"
 #include "missing.h"
 #include "rlimit-util.h"

src/basic/socket-util.c

@@ -34,7 +34,7 @@
 #include "alloc-util.h"
 #include "fd-util.h"
 #include "fileio.h"
-#include "formats-util.h"
+#include "format-util.h"
 #include "log.h"
 #include "macro.h"
 #include "missing.h"

src/basic/user-util.c

@@ -34,7 +34,7 @@
 #include "alloc-util.h"
 #include "fd-util.h"
 #include "fileio.h"
-#include "formats-util.h"
+#include "format-util.h"
 #include "macro.h"
 #include "missing.h"
 #include "parse-util.h"

src/basic/util.c

@@ -41,7 +41,7 @@
 #include "dirent-util.h"
 #include "fd-util.h"
 #include "fileio.h"
-#include "formats-util.h"
+#include "format-util.h"
 #include "hashmap.h"
 #include "hostname-util.h"
 #include "log.h"

src/basic/util.h

@@ -41,7 +41,7 @@
 #include <time.h>
 #include <unistd.h>
 
-#include "formats-util.h"
+#include "format-util.h"
 #include "macro.h"
 #include "missing.h"
 #include "time-util.h"