ipautil: move kinit functions to ipalib.install

kinit_password() depends on ipaplatform.

Move kinit_password() as well as kinit_keytab() to a new
ipalib.install.kinit module, as they are used only from installers.

https://fedorahosted.org/freeipa/ticket/6474

Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>

install/tools/ipa-ca-install

@@ -22,6 +22,8 @@ import sys
 import os
 import shutil
 import tempfile
+
+from ipalib.install.kinit import kinit_keytab
 from ipapython import ipautil
 
 from ipaserver.install import installutils
@@ -227,7 +229,7 @@ def promote(safe_options, options, filename):
     with ipautil.private_ccache():
         ccache = os.environ['KRB5CCNAME']
 
-        ipautil.kinit_keytab(
+        kinit_keytab(
             'host/{env.host}@{env.realm}'.format(env=api.env),
             paths.KRB5_KEYTAB,
             ccache)