ACCUMULO-2211 Add missing delay in Security randomwalk CreateUser

This commit adds a one second delay after creating the "table" user in the Security
randomwalk test, in the case where the creation fails with a permission denied error,
but the user needs to be created anyway to continue the test. The delay accompanies
those added in ACCUMULO-1123.
Merge branch '1.4.5-SNAPSHOT' into 1.5.1-SNAPSHOT

Conflicts:
	test/src/main/java/org/apache/accumulo/test/randomwalk/security/CreateUser.java
Merge branch '1.5.1-SNAPSHOT' into 1.6.0-SNAPSHOT