Server Upgrade: Allow base64 encoded values

This patch allows to use base64 encoded values in update files.

Double colon ('::') must be used as separator between attribute name
and base64 encoded value.

add:attr::<base64-value>
replace:attr::<old-base64-value>::<new-base64-value>

https://fedorahosted.org/freeipa/ticket/4984

Reviewed-By: Jan Cholasta <jcholast@redhat.com>

install/tools/man/ipa-ldap-updater.1

@@ -39,7 +39,7 @@ There are 7 keywords:
     * only: set an attribute to this
     * onlyifexist: set an attribute to this only if the entry exists
     * deleteentry: remove the entry
-    * replace: replace an existing value, format is old: new
+    * replace: replace an existing value, format is old::new
     * addifnew: add a new attribute and value only if the attribute doesn't already exist. Only works with single\-value attributes.
     * addifexist: add a new attribute and value only if the entry exists. This is used to update optional entries.
 
@@ -57,6 +57,12 @@ The available template variables are:
     * $LIBARCH \- set to 64 on x86_64 systems to be used for plugin paths
     * $TIME \- an integer representation of current time
 
+For base64 encoded values a double colon ('::') must be used between attribute and value.
+
+Base64 format examples:
+    add:binaryattr::d2UgbG92ZSBiYXNlNjQ=
+    replace:binaryattr::SVBBIGlzIGdyZWF0::SVBBIGlzIHJlYWxseSBncmVhdA==
+
 A few rules:
 
    1. Only one rule per line