rhn_page: do not limit profile name length

Currently we have a length limit of 3 chars to
profile name field. This patch removes this
limitation.

Change-Id: I94dac47c8cdb7bb96d9314a7283310cd89519ace
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1105296
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>