feat(MCOL-6082) Cluster with read-only nodes should correctly work with DML

This patch changes logic from counting all nodes to counting only
read-write nodes when messaging about DML operations.

feat(MCOL-6082): Multiple readers of dbroots using OamCache logic

This patch introduces centralized logic of selecting what dbroot is
accessible in PrimProc on what node. The logic is in OamCache for time
being and can be moved later.

Fix build

dmlproc/dmlprocessor.cpp

@@ -1404,7 +1404,9 @@ void DMLProcessor::operator()()
       messageqcpp::ByteStream::byte status = 255;
       messageqcpp::ByteStream::octbyte rowCount = 0;
 
-      if (fDbrm->getSystemState(stateFlags) >
+      int rr = fDbrm->getSystemState(stateFlags);
+
+      if (rr >
           0)  // > 0 implies succesful retrieval. It doesn't imply anything about the contents
       {
         messageqcpp::ByteStream results;
@@ -1845,7 +1847,7 @@ void DMLProcessor::operator()()
 
 void RollbackTransactionProcessor::processBulkRollback(BRM::TableLockInfo lockInfo, BRM::DBRM* dbrm,
                                                        uint64_t uniqueId,
-                                                       OamCache::dbRootPMMap_t& dbRootPMMap,
+                                                       OamCache* oamcache,
                                                        bool& lockReleased)
 {
   // Take over ownership of stale lock.
@@ -1884,7 +1886,7 @@ void RollbackTransactionProcessor::processBulkRollback(BRM::TableLockInfo lockIn
 
   for (uint32_t i = 0; i < lockInfo.dbrootList.size(); i++)
   {
-    pmId = (*dbRootPMMap)[lockInfo.dbrootList[i]];
+    pmId = oamcache->getOwnerPM(lockInfo.dbrootList[i]);
     pmSet.insert(pmId);
   }