Report pg/history from OSD on every degraded activation

Required to prevent data loss due to activation of an OSD with older data
when PG OSD set change doesn't occur. I.e. fixes the simplest case:
- Run 2 OSDs with 1 PG
- Start writing into the PG
- Stop OSD 2
- Stop OSD 1
- Start OSD 2

After this change the PG will refuse to start after the last step.

src/pg_states.cpp

@@ -3,11 +3,12 @@
 
 #include "pg_states.h"
 
-const int pg_state_bit_count = 15;
+const int pg_state_bit_count = 16;
 
-const int pg_state_bits[15] = {
+const int pg_state_bits[16] = {
     PG_STARTING,
     PG_PEERING,
+    PG_PEERED,
     PG_INCOMPLETE,
     PG_ACTIVE,
     PG_REPEERING,
@@ -22,9 +23,10 @@ const int pg_state_bits[15] = {
     PG_LEFT_ON_DEAD,
 };
 
-const char *pg_state_names[15] = {
+const char *pg_state_names[16] = {
     "starting",
     "peering",
+    "peered",
     "incomplete",
     "active",
     "repeering",