The run failed with "NodeLost" status

**NOTE**: Such behavior doesn't appear constantly, "flaky" bug.

- Environment: AZURE
- Version: 0.15.0.944.582d8809f2
- Step to reproduce:

1. Create a shell template pipeline
2. Launch the created pipeline
4. Click on the just-launched run at "ACTIVE RUNS" tab on Runs page

**Exp**.: The run is running
**Act**.: The run failed with "NodeLost" status and run tasks were not executed


As we can see from pipeline logs:

`AutoscaleManager - Failed to load pipeline run 1297.
[ERROR] 2019-05-15 00:21:33.258 [taskScheduler-3] AutoscaleManager - Pipeline with requested id: '1,297' was not found.
java.lang.IllegalArgumentException: Pipeline with requested id: '1,297' was not found.
at org.springframework.util.Assert.notNull(Assert.java:134) ~[spring-core-4.3.7.RELEASE.jar!/:4.3.7.RELEASE]
at com.epam.pipeline.manager.pipeline.PipelineRunManager.loadPipelineRun(PipelineRunManager.java:380)`

Start with PipelineRunManager.java at loadPipelineRun, then trace the AutoscaleManager path shown in the logs. Reproduce the shell template pipeline on Azure and follow the run from the ACTIVE RUNS tab. Done means the run does not become NodeLost because its pipeline run cannot be loaded, and the run tasks execute as expected.

Written by the indexing model from the issue text.