Issue #2519 was fixed.
Fixed issue #2541: UPDATE REMOVE does not support subqueries
refactoring
refactoring
Distributed: fixed issue with login name. Restored TestSharding
Merge branch 'orientdb-2541' into 1.7.5
Fixed issue #2537
Import: added check if index name is missing
Distributed: fixed problem with thread local database
Fixed issue #2547
Issue #2542 was fixed.
Merge remote-tracking branch 'origin/1.7.5' into 1.7.5
Merge branch '1.7.5' into develop

Conflicts:
	core/src/main/java/com/orientechnologies/orient/core/metadata/schema/OClassImpl.java
	distributed/src/main/java/com/orientechnologies/orient/server/hazelcast/OHazelcastDistributedDatabase.java
	server/src/main/java/com/orientechnologies/orient/server/distributed/ODistributedStorage.java
	tests/src/test/java/com/orientechnologies/orient/test/database/auto/SchemaIndexTest.java