Undeprecate commandline params forcequotacheck, fastboot, and forcefsck

Those are historical names, but there is nothing wrong with them. The files on
/ (/fastboot, /forcefsck, and /forcequotacheck) are problematic because they
require a modification of the root file system. But the commandline params work
fine. They have the obvious advantage compared to our "modern" option that they
are much easier to type without looking up the spelling in the docs. Undeprecate
them to avoid unnecessary churn.

(cherry picked from commit 5598454)
(cherry picked from commit eb841e9)
(cherry picked from commit 59d4a05)
(cherry picked from commit dc84575)
(cherry picked from commit 59b7b0d)

Author: keszybz

src/fsck/fsck.c

@@ -106,16 +106,11 @@ static int parse_proc_cmdline_item(const char *key, const char *value, void *dat
                 }
         }
 
-#if HAVE_SYSV_COMPAT
-        else if (streq(key, "fastboot") && !value) {
-                log_warning("Please pass 'fsck.mode=skip' rather than 'fastboot' on the kernel command line.");
+        else if (streq(key, "fastboot") && !value)
                 arg_skip = true;
 
-        } else if (streq(key, "forcefsck") && !value) {
-                log_warning("Please pass 'fsck.mode=force' rather than 'forcefsck' on the kernel command line.");
+        else if (streq(key, "forcefsck") && !value)
                 arg_force = true;
-        }
-#endif
 
         return 0;
 }

src/quotacheck/quotacheck.c

@@ -33,14 +33,9 @@ static int parse_proc_cmdline_item(const char *key, const char *value, void *dat
                         arg_skip = true;
                 else
                         log_warning("Invalid quotacheck.mode= parameter '%s'. Ignoring.", value);
-        }
 
-#if HAVE_SYSV_COMPAT
-        else if (streq(key, "forcequotacheck") && !value) {
-                log_warning("Please use 'quotacheck.mode=force' rather than 'forcequotacheck' on the kernel command line.");
+        } else if (streq(key, "forcequotacheck") && !value)
                 arg_force = true;
-        }
-#endif
 
         return 0;
 }