fix bug in modules/system/user.py (FreeBSD)

[lr1980]

SUMMARY

for freebsd tool "pw" use date not days in "modify_user"

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

user

ADDITIONAL INFORMATION

When you modify a user and set a expire date that is in the past, the "-e" argument of the FreeBSD tool "pw" is set to "-1" because it calculates the day diff to now. This means the expire date of the user is set to "now - 1 second" => thats wrong. Here is the man page info:

  -e date       Set the account's expiration date.  Format of the date is
               either a UNIX time in decimal, or a date in `dd-mmm-yy[yy]'
               format, where dd is the day, mmm is the month, either in
               numeric or alphabetic format ('Jan', 'Feb', etc) and year
               is either a two or four digit year.  This option also
               accepts a relative date in the form `+n[mhdwoy]' where `n'
               is a decimal, octal (leading 0) or hexadecimal (leading 0x)
               digit followed by the number of Minutes, Hours, Days,
               Weeks, Months or Years from the current date at which the
               expiration date is to be set.

[ansibot]

cc @sfromm
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