[midPoint-git] [Evolveum/midpoint] c105f0: Improve custom function library initialization

[Pavol Mederly]

  Branch: refs/heads/fix/mid-4396
  Home:   https://github.com/Evolveum/midpoint
  Commit: c105f0c02b9fd52738dab980e8051568e9a815bb
      https://github.com/Evolveum/midpoint/commit/c105f0c02b9fd52738dab980e8051568e9a815bb
  Author: Pavol Mederly <mederly at evolveum.com>
  Date:   2018-01-19 (Fri, 19 Jan 2018)

  Changed paths:
    M model/model-common/src/main/java/com/evolveum/midpoint/model/common/expression/script/ScriptExpressionFactory.java
    M model/model-common/src/test/java/com/evolveum/midpoint/model/common/expression/script/AbstractScriptTest.java
    M model/model-common/src/test/java/com/evolveum/midpoint/model/common/expression/script/TestScriptCaching.java
    M model/model-impl/src/main/resources/ctx-model.xml
    M repo/repo-common/src/main/java/com/evolveum/midpoint/repo/common/expression/ExpressionFactory.java

  Log Message:
  -----------
  Improve custom function library initialization

Because of doubts concerning MID-4396 the code that initializes
function libraries (and custom ones in particular) was cleaned up
a bit. Synchronization and privileged access were implemented.