RegDeploy: in some cases DeploymentToolkit deployJava.getPlugin().isPlugin2() returns incorrect info

Desc:
  1. This issue has been initially detected with 7u4 b11 + FX 2.1
  2. When we switch to old plugin DeploymentToolkit deployJava.getPlugin().isPlugin2() still returns 1.
  3. It's hard to reproduce with 7u4 b13 + FX 2.1 ( b14 ) because of CR 7148846 ( switching to old plugin doesn't work ), but it still happens.
  4. I managed to reproduce this issue variation: new plugin actually works, but deployJava.getPlugin().isPlugin2() != 1.
  See screenshot and *.PML log attached ( PML log stared just before clicking on button that calls DT
  methods including deployJava.getPlugin().isPlugin2() )