[Fiware-tech-help] [Chp - IoT][IDAS] Avoid using fixed gid and uid numbers for group and user creation

[David Muriel]

Some of the sections of the installation guide instruct us to create
some system groups and users.  The commands used to create this groups
and users use fixed values for the gid and uid numbers.  Depending on
the system where we are trying to install the platform, we may find
that those values are already in use by other groups and users.

Unless it is strictly needed for the platform to have this groups and
users with those specific gid and uid values, it is better to let the
OS assign those values automatically from the available pool.  If the
platform needs to have those groups and users with the values
specified on the installation guide, it must be clearly stated in the
document and instruct the user to resolve any conflict before
proceeding.