misc/171113: FreeBSD 9.1-beta1 installer refuses to partition flash

[Robert Bonomi]

>       medium

Attempts to respond to te poste of this PR get:
    ----- Transcript of session follows -----
... while talking to elstel.rivido.de.:
>>> DATA
   ----- Transcript of session follows -----
... while talking to elstel.rivido.de.:
>>> DATA
<<< 550 5.1.1 <estellnb at elstel.rivido.de>: Recipient address rejected: User unknown in virtual alias table
550 5.1.1 estellnb at elstel.rivido.de... User unknown
<<< 554 5.5.1 Error: no valid recipients
   ----- Transcript of session follows -----
... while talking to elstel.rivido.de.:
>>> DATA
<<< 550 5.1.1 <estellnb at elstel.rivido.de>: Recipient address rejected: User unknown in virtual alias table
550 5.1.1 estellnb at elstel.rivido.de... User unknown
<<< 554 5.5.1 Error: no valid recipients