[PATCH] Fix flapping user_virtualCryptSHA and user_wdigest tests

[Gary Lockyer]

Both tests use "samba-tool user create" to create a user, with a random
password. If the random password contained shell metacharacters or '-'
failures like
https://git.samba.org/autobuild.flakey.sn-devel-144/2017-06-03-1418/samba.stdout
occurred.

This patch restricts the generated passwords to [A-Za-z0-9]


Review and push appreciated

Gary
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