Our two migraton scripts for csmh -> csmhe

Additionally, a slow deleting scripts for sites that cannot
use truncate.

util/csmh-extended/migrate-same-database-instance.sh

+MINID=0
+MAXID=1003426362
+STEP=10000
+MIGRATE_USER=migrate
+PASSWORD='secret-password'
+HOST='my-database-instance'
+ 
+ 
+for ((i=0; i<=$MAXID; i+=$STEP)); do
+echo -n "$i";
+mysql -u $MIGRATE_USER -p$PASSWORD -h $HOST wwc <<EOF
+INSERT INTO edxapp_csmh.coursewarehistoryextended_studentmodulehistoryextended (id, version, created, state, grade, max_grade, student_module_id)
+  SELECT id, version, created, state, grade, max_grade, student_module_id
+  FROM wwc.courseware_studentmodulehistory
+  WHERE id BETWEEN $i AND $(($i+$STEP-1));
+EOF
+echo '.';
+sleep 2
+done

util/csmh-extended/migrate-separate-database-instances.sh

+MINID=0
+MAXID=1003426362
+STEP=10000
+MIGRATE_USER=migrate
+PASSWORD='secret-password'
+HOST='my-database-instance'
+ 
+ 
+for ((i=$MINID-1; i<=$MAXID; i+=$STEP)); do
+echo -n "$i";
+mysql -u $MIGRATE_USER -p$PASSWORD -h $HOST wwc <<EOF
+INSERT INTO wwc.coursewarehistoryextended_studentmodulehistoryextended (id, version, created, state, grade, max_grade, student_module_id)
+  SELECT id, version, created, state, grade, max_grade, student_module_id
+  FROM wwc.courseware_studentmodulehistory
+  WHERE id BETWEEN $i AND $(($i+$STEP-1));
+EOF
+echo '.';
+sleep 2;
+done

util/csmh-extended/slow-delete.sh

+MINID=0
+MAXID=1003426362
+STEP=20000
+MIGRATE_USER=migrate
+PASSWORD='secret'
+HOST='host'
+ 
+ 
+for ((i=$MINID-1; i<=$MAXID; i+=$STEP)); do
+echo -n "$i";
+time mysql -u $MIGRATE_USER -p$PASSWORD -h $HOST wwc <<EOF
+  DELETE FROM courseware_studentmodulehistory where id < $i
+EOF
+sleep 3;
+done