pgexternaltable - src: add interface for HDFS

Log Message:
-----------
add interface for HDFS

Modified Files:
--------------
    src/externaltable/exttab:
        Buffer.h (r1.1 -> r1.2)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgexternaltable/src/externaltable/exttab/Buffer.h?r1=1.1&r2=1.2)
        Interface_FileBuffer.cc (r1.3 -> r1.4)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgexternaltable/src/externaltable/exttab/Interface_FileBuffer.cc?r1=1.3&r2=1.4)
        externaltab.c (r1.2 -> r1.3)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgexternaltable/src/externaltable/exttab/externaltab.c?r1=1.2&r2=1.3)
        externaltab.h (r1.1 -> r1.2)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgexternaltable/src/externaltable/exttab/externaltab.h?r1=1.1&r2=1.2)
        externaltab.sql.in (r1.1 -> r1.2)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgexternaltable/src/externaltable/exttab/externaltab.sql.in?r1=1.1&r2=1.2)
        getExtTabInfo.c (r1.1 -> r1.2)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgexternaltable/src/externaltable/exttab/getExtTabInfo.c?r1=1.1&r2=1.2)
        getExtTabInfo.h (r1.1 -> r1.2)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgexternaltable/src/externaltable/exttab/getExtTabInfo.h?r1=1.1&r2=1.2)

Added Files:
-----------
    src/externaltable/exttab:
        common.h (r1.1)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgexternaltable/src/externaltable/exttab/common.h?rev=1.1&content-type=text/x-cvsweb-markup)