OPENDJ-2772 Code cleanup

* Improve code readability
    * Rename local variables (like parameters)
    * Factorize duplicated pieces of code across tools in Utils
        * arguments parsing
        * reading filters from string or file
        * reading controls
        * print messages
    * Create LDAPToolArgumentParser to have a fluent way to build
argument parser and to mutualize argument parsing code generation for
ldap* tools.
    * Create LDAPToolException class to handle error which may occur
during tool exection. This class manages return code and localizable
error message and allow code factorization in Utils.

* Mutualize generation code of the following arguments:
    * -f, --fileName
    * -S, --scriptFriendly
    * --showUsage argument generation in make-ldif
    * -J, --control

* MakeLDIFInputStream.java
    * Remove unused templateFile field
    * Inline generatorThread field

* Other little cleanup actions