Broken master

[Nikolay Izhikov-2]

Hello, Igniters.

Current master is broken with this commit:

https://github.com/apache/ignite/commit/c23f6b0c11df9c0a9cd55e87e0f9b4c6771ce43f

Andrew, please, fix it.

```
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project ignite-core: Compilation failure: Compilation failure:
[ERROR] /home/dragon/src/ignite/modules/core/src/main/java/org/apache/ignite/internal/processors/cache/mvcc/MvccUtils.java:[38,38] cannot find symbol
[ERROR]   symbol:   class TransactionMixedModeException
[ERROR]   location: package org.apache.ignite.transactions
[ERROR] /home/dragon/src/ignite/modules/core/src/main/java/org/apache/ignite/internal/processors/cache/mvcc/MvccUtils.java:[40,38] cannot find symbol
[ERROR]   symbol:   class TransactionUnsupportedConcurrencyException
[ERROR]   location: package org.apache.ignite.transactions
[ERROR] /home/dragon/src/ignite/modules/core/src/main/java/org/apache/ignite/internal/processors/odbc/jdbc/JdbcRequestHandler.java:[66,38] cannot find symbol
[ERROR]   symbol:   class TransactionMixedModeException
[ERROR]   location: package org.apache.ignite.transactions
[ERROR] /home/dragon/src/ignite/modules/core/src/main/java/org/apache/ignite/internal/processors/odbc/jdbc/JdbcRequestHandler.java:[70,38] cannot find symbol
[ERROR]   symbol:   class TransactionUnsupportedConcurrencyException
[ERROR]   location: package org.apache.ignite.transactions
[ERROR] /home/dragon/src/ignite/modules/core/src/main/java/org/apache/ignite/internal/processors/odbc/odbc/OdbcRequestHandler.java:[42,38] cannot find symbol
[ERROR]   symbol:   class TransactionMixedModeException
[ERROR]   location: package org.apache.ignite.transactions
[ERROR] /home/dragon/src/ignite/modules/core/src/main/java/org/apache/ignite/internal/processors/odbc/odbc/OdbcRequestHandler.java:[43,38] cannot find symbol
[ERROR]   symbol:   class TransactionUnsupportedConcurrencyException
[ERROR]   location: package org.apache.ignite.transactions
[ERROR] /home/dragon/src/ignite/modules/core/src/main/java/org/apache/ignite/internal/processors/cache/mvcc/MvccUtils.java:[718,27] cannot find symbol
[ERROR]   symbol:   class TransactionUnsupportedConcurrencyException
[ERROR]   location: class org.apache.ignite.internal.processors.cache.mvcc.MvccUtils
[ERROR] /home/dragon/src/ignite/modules/core/src/main/java/org/apache/ignite/internal/processors/cache/mvcc/MvccUtils.java:[724,27] cannot find symbol
[ERROR]   symbol:   class TransactionMixedModeException
[ERROR]   location: class org.apache.ignite.internal.processors.cache.mvcc.MvccUtils
[ERROR] /home/dragon/src/ignite/modules/core/src/main/java/org/apache/ignite/internal/processors/odbc/jdbc/JdbcRequestHandler.java:[1151,26] cannot find symbol
[ERROR]   symbol:   class TransactionMixedModeException
[ERROR]   location: class org.apache.ignite.internal.processors.odbc.jdbc.JdbcRequestHandler
[ERROR] /home/dragon/src/ignite/modules/core/src/main/java/org/apache/ignite/internal/processors/odbc/jdbc/JdbcRequestHandler.java:[1153,26] cannot find symbol
[ERROR]   symbol:   class TransactionUnsupportedConcurrencyException
[ERROR]   location: class org.apache.ignite.internal.processors.odbc.jdbc.JdbcRequestHandler
[ERROR] /home/dragon/src/ignite/modules/core/src/main/java/org/apache/ignite/internal/processors/odbc/odbc/OdbcRequestHandler.java:[986,26] cannot find symbol
[ERROR]   symbol:   class TransactionMixedModeException
[ERROR]   location: class org.apache.ignite.internal.processors.odbc.odbc.OdbcRequestHandler
[ERROR] /home/dragon/src/ignite/modules/core/src/main/java/org/apache/ignite/internal/processors/odbc/odbc/OdbcRequestHandler.java:[988,26] cannot find symbol
[ERROR]   symbol:   class TransactionUnsupportedConcurrencyException
[ERROR]   location: class org.apache.ignite.internal.processors.odbc.odbc.OdbcRequestHandler
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
[ERROR]
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR]   mvn <goals> -rf :ignite-core
```