Changes included: 7 changes.

Change 52b7c7c6b21acf260942c285da1468c4f939a009 by andrew hanushevsky <[log in to unmask]> (4 files): Use the generic security loader for the cmsd. This also fixses some
disparities between the two daemons in how this is done.

Change f5f7dc1dbd06c5c472b5d7e399535ea594a82eb1 by andrew hanushevsky <[log in to unmask]> (1 file): Update notes on security framework enhancements.

Change 88193e0559d903b1691d9f29daca212e28891089 by andrew hanushevsky <[log in to unmask]> (2 files): Remove loading of the security framework as a) it was never used, b) it would never get loaded anyway, and c) it would generate a spurious warning message.

Change ce29fb728bfa4b1791b611fd89c5a1daeb7f5ab8 by andrew hanushevsky <[log in to unmask]> (3 files): Rationalize the XrdSecLoadSecurity function to make it easier to use.
Allow "xrootd.seclib default" to load the default library.

Change 5c6346c7a98ccf903d5824ab61b82caf11f319dd by andrew hanushevsky <[log in to unmask]> (1 file): Make http use the new security loader interface.

Change c8a7d2395f1c07027b4645efac4b69e162671d39 by andrew hanushevsky <[log in to unmask]> (1 file): Update notes about plugin versoning.

Change cd138ba4e99da4328f92790e1d205d37d799e2a6 by andrew hanushevsky <[log in to unmask]> (10 files): Implement dynamic plugin shared library filename versioning to allow
multiple major versions to co-exist (currently only for security).
Add new security framework loader to allow pacakges that used to
link against security libraries to dynamically load them.