Use appropriate database settings for Spring integration tests generation

[EgorkaKulikov]

Description

Consider generating integration tests for Spring project.
Concrete execution is used, it requires to establish database connection for many projects

Concrete database settings must be the following (h2 in-memory database is used):

spring:
  datasource:
    url: jdbc:h2:mem:testdb
    username: sa
    password: password
  jpa:
    hibernate:
      ddl-auto: create-drop
    show-sql: true
    generate-ddl: true