WL#1757: NDB: Increase MAX_NO_OF_ATTRIBUTES to 4096

Affects: Server-7.1   —   Status: Un-Assigned   —   Priority: Medium

Increase max number of attributes in a table to same as MAX_FIELDS in MySQL 
which si 4096.

* Increase value of NDB_MAX_ATTRIBUTES in ndbapi_limits.h
* Increase value of MAX_ATTRIBUTES in ndb_limits.h

* Implemented sending of fragmented signals _from_ NdbApi in function