Remove EXEC_ON_READ from ClearModuleList and AddModule. Having these

as EXEC_ON_READ was causing a seg fault, and it was unnecessary.  Neither
of these directives changes how the server interprets the config file,
they only change how the server responds to the configuration.
PR:	6318


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@85883 13f79535-47bb-0310-9956-ffa450edef68