Fix Encoder.encodeForLDAP and Encoder.encodeForDN so they are strictly conformant with Section 3 of RFC 4515

[kwwall]

Describe the bug
The implementations for ESAPI 2.5.2.0 and earlier for the Encoder.encodeForLDAP and Encoder.encodeForDN is not strictly conformant to Section 3 of RFC 4515

Specify what ESAPI version(s) you are experiencing this bug in
All previous ESAPI versions.

Resolved
With @noloader's PR #790.

[kwwall]

PR #790 addresses this. This GitHub issue was created after the fix just to track this in the 2.5.3.0 release notes.