ipaclient: No kinit on controller for deployment using OTP

The generation of the OTP for client deployment is now completely
happening on the first of the given or detected servers with delegate_to.
The module ipaclient_get_otp has been replaced by a new module using code
from ipahost module and module_utils ansible_freeipa_module.

The action plugin ipaclient_get_otp has been removed and with this also
ipaclient_get_facts.

If an admin keytab is used instead of an admin password, it is copied to
the server as a temporary file to enable the OTP generation. The temporary
file is removed again after using the ipaclient_get_otp module.

The utils script build-galaxy-release.sh has been updated to not copy the
ipaclient action plugin to the global plugins folder of the collection.

This change is import for the use of the ipaclient role with AAP as only
the base environment is sufficient now.

The ipaclient README and also the global README have been updated as
kinit is not needed anymore on the controller for OTP.

Fixes #903 (Allow the use of principals other than admin when using
            ipaadmin_keytab)

README.md

@@ -69,7 +69,6 @@ Requirements
 
 **Controller**
 * Ansible version: 2.8+ (ansible-freeipa is an Ansible Collection)
-* /usr/bin/kinit is required on the controller if a one time password (OTP) is used
 
 **Node**
 * Supported FreeIPA version (see above)
@@ -289,7 +288,7 @@ ipaserver_domain=test.local
 ipaserver_realm=TEST.LOCAL
 ```
 
-For enhanced security it is possible to use a auto-generated one-time-password (OTP). This will be generated on the controller using the (first) server.
+For enhanced security it is possible to use a auto-generated one-time-password (OTP). This will be generated on the (first) server.
 
 To enable the generation of the one-time-password:
 ```yaml

roles/ipaclient/README.md

@@ -32,7 +32,6 @@ Requirements
 
 **Controller**
 * Ansible version: 2.8+
-* /usr/bin/kinit is required on the controller if a one time password (OTP) is used
 
 **Node**
 * Supported FreeIPA version (see above)
@@ -172,7 +171,7 @@ Server Variables
 Variable | Description | Required
 -------- | ----------- | --------
 `ipaservers` | This group is a list of the IPA server full qualified host names. In a topology with a chain of servers and replicas, it is important to use the right server or replica as the server for the client. If there is a need to overwrite the setting for a client in the `ipaclients` group, please use the list `ipaclient_servers` explained below. If no `ipaservers` group is defined than the installation preparation step will try to use DNS autodiscovery to identify the the IPA server using DNS txt records. | mostly
-`ipaadmin_keytab` | The string variable enables the use of an admin keytab as an alternative authentication method. The variable needs to contain the local path to the keytab file. If `ipaadmin_keytab` is used, then `ipaadmin_password` does not need to be set. If `ipaadmin_keytab` is used with `ipaclient_use_otp: yes` then the keytab needs to be available on the controller, else on the client node. The use of full path names is recommended.  | no
+`ipaadmin_keytab` | The string variable enables the use of an admin keytab as an alternative authentication method. The variable needs to contain the local path to the keytab file. If `ipaadmin_keytab` is used, then `ipaadmin_password` does not need to be set. If `ipaadmin_keytab` is used with `ipaclient_use_otp: yes` then the keytab needs to be available on the controller, else on the client node. The use of full path names is recommended. | no
 `ipaadmin_principal` | The string variable only needs to be set if the name of the Kerberos admin principal is not "admin". If `ipaadmin_principal` is not set it will be set internally to "admin". | no
 `ipaadmin_password` | The string variable contains the Kerberos password of the Kerberos admin principal. If `ipaadmin_keytab` is used, then `ipaadmin_password` does not need to be set. | mostly