XD-212
Add http port command line option to Admin server

removing StreamServer.main()
XD-206
Consider pre-existing xd.home system property
For both ContainerMain & AdminMain, XD home is set in the following ways:

1) From xd-* scripts, specify "--xdHomeDir" command line option.
   This will override any existing system property "xd.home".
2) If "--xdHomeDir" is not specified, then the "xd.home" system property will
   have the preference
3) If both "--xdHomeDir" and "xd.home" system property are not provided,
   then the relative path ".." is set to be XD home
XD-165
Externalize log4j config for xd-admin & xd-container scripts
  Added xd-admin & xd-container logger properties with rolling file appender
  Updated scripts to use the logger properties
  Set container log file name based on it's id
  Modified AbstractMain's setXDHome() to use exisitng xd.home system property(that comes mostly from scripts)