Fix decryption of indexed (list) properties.

[kvmw]

This pull request fixes #1253.

It also fixes the following cases:

• In current (before this fix) implementation, when there is a list (indexed) property with encrypted items in a property source, All lists are copied to the new decrypted property-source, not only the one that has encrypted items.

For example, in the following case only my-list should be copied to the decrypted property source but current implementation copies another-list as well.

  my-list:
    - foo: '{cipher}4ffef9'
    - foo: 'plain'
    - foo: 'another plain value'
 
  another-list:
    - bar: plain
    - bar: another plain   

• When searching for properties, during decryption, relaxed-binding should be considered. Otherwise It is not possible to override the value of foo.text : '{cipher}4ffef9' by adding FOO_TEXT : 'updated value' in another property source with higher priority.

[ryanjbaxter]

Could you submit this against the 4.3.x branch instead?

[kvmw]

closing in favour of #1634 1634