Renamed LFS_CKMETAPARITY and LFS_CKDATACKSUMREADS

- LFS_CKPARITY -> LFS_CKMETAPARITY
- LFS_CKDATACKSUMS -> LFS_CKDATACKSUMREADS

The goal here is to provide hints for 1. what is being checked (META,
DATA, etc), and 2. on what operation (FETCHES, PROGS, READS, etc).

Note that LFS_CKDATACKSUMREADS is intended to eventually be a part of a
set of flags that can pull off closed fully-checked reads:

- LFS_CKMETAREDUNDREADS - Check data checksums on reads
- LFS_CKDATACKSUMREADS - Check metadata redund blocks on reads
- LFS_CKREADS - LFS_CKMETAREDUNDREADS + LFS_CKDATACKSUMREADS

Also it's probably not a bad idea for LFS_CKMETAPARITY to be harder to
use. It's really not worth enabling unless you understand its
limitations (<1 bit of error detection, yay).

No code changes.

scripts/dbgflags.py

@@ -65,8 +65,9 @@ FLAGS = [
     ('F', 'REVNOISE',  0x00000020, "Add noise to revision counts"             ),
     ('F', 'CKPROGS',   0x00000800, "Check progs by reading back progged data" ),
     ('F', 'CKFETCHES', 0x00001000, "Check block checksums before first use"   ),
-    ('F', 'CKPARITY',  0x00002000, "Check metadata tag parity bits"           ),
-    ('F', 'CKDATACKSUMS',
+    ('F', 'CKMETAPARITY',
+                       0x00002000, "Check metadata tag parity bits"           ),
+    ('F', 'CKDATACKSUMREADS',
                        0x00008000, "Check data checksums on reads"            ),
 
     ('F', 'CKMETA',    0x00100000, "Check metadata checksums"                 ),
@@ -82,8 +83,9 @@ FLAGS = [
     ('M', 'REVNOISE',  0x00000020, "Add noise to revision counts"             ),
     ('M', 'CKPROGS',   0x00000800, "Check progs by reading back progged data" ),
     ('M', 'CKFETCHES', 0x00001000, "Check block checksums before first use"   ),
-    ('M', 'CKPARITY',  0x00002000, "Check metadata tag parity bits"           ),
-    ('M', 'CKDATACKSUMS',
+    ('M', 'CKMETAPARITY',
+                       0x00002000, "Check metadata tag parity bits"           ),
+    ('M', 'CKDATACKSUMREADS',
                        0x00008000, "Check data checksums on reads"            ),
 
     ('M', 'MKCONSISTENT',
@@ -109,9 +111,10 @@ FLAGS = [
     ('I', 'REVNOISE',  0x00000020, "Mounted with LFS_M_REVNOISE"              ),
     ('I', 'CKPROGS',   0x00000800, "Mounted with LFS_M_CKPROGS"               ),
     ('I', 'CKFETCHES', 0x00001000, "Mounted with LFS_M_CKFETCHES"             ),
-    ('I', 'CKPARITY',  0x00002000, "Mounted with LFS_M_CKPARITY"              ),
-    ('I', 'CKDATACKSUMS', 
-                       0x00008000, "Mounted with LFS_M_CKDATACKSUMS"          ),
+    ('I', 'CKMETAPARITY',
+                       0x00002000, "Mounted with LFS_M_CKMETAPARITY"          ),
+    ('I', 'CKDATACKSUMREADS', 
+                       0x00008000, "Mounted with LFS_M_CKDATACKSUMREADS"      ),
  
     ('I', 'MKCONSISTENT',
                        0x00010000, "Filesystem needs mkconsistent to write"   ),