Remove mapping of atftpd to tftpd-server

These are different tftp implementations, tftpd-hpa and tftpd-server are
equivalent, this mapping was added in a previous commit.

Change-Id: Idd1f554d4ee8e1d3c515d5f2f191e90abe0ff396

elements/fedora/bin/map-packages

@@ -54,7 +54,6 @@ package_map = {
     'mysql-server-5.5' : 'mariadb-server',
     'libmysql-java' : 'mysql-connector-java',
     'default-jre' : 'java',
-    'atftpd' : 'tftp-server',
     'tftpd-hpa' : 'tftp-server',
     'apache2': 'httpd',
     'libapache2-mod-wsgi': 'mod_wsgi',

elements/rhel/bin/map-packages

@@ -26,7 +26,6 @@ package_map = {
     'augeas-tools': 'augeas',
     'openssh-client': 'openssh-clients',
     'default-jre': 'java-1.7.0-openjdk',
-    'atftpd': 'tftp-server',
     'tftpd-hpa' : 'tftp-server',
     }