Enhancement - Support of Directories

[lechnerc77]

With this enhancement you can create or use directories when setting up the BTP account.

Basic configuration is done via usedirectory in parameters.json. This boolean parameter defines if a directory should be used/created when setting up the subaccount.

The following options exist for the further specification:

• no further parameters: A new directory is created; naming is derived by tool
• specification of directoryname: a new directory is created using this name. If a directory with the same name exists, this will be taken
• specification of directoryid (= existing directory): the corresponding directory will be used when the subaccount is created.

Restrictions:

• you can only specify one directory and assign one subaccount to it
• you can only specify a directory name when creating a new one
• you cannot define nested structures (directory in directory)

Targeting issue #272