Authorization checks for DDL & utilities

    Fixed issues from code comments.

    LOAD/UNLOAD authorization checks:

    Code was added during code generation to make sure user has privileges,
    if the user had necessary privileges, then the EXEUTIL parser flag is
    turned on to avoid further privilege checks.  When load/unload
    completes, the parser flag is reset.

    Update/showstats Statistics authorization checks:

    Added a new error message
    Changed hs_globals to support a new isAuthorized method and store
    parser flags when class is instantiated and reset them when done
    Changed hs_cli.cpp to use new IF NOT EXISTS syntax when creating
    histogram tables, make owner of histogram tables DB__ROOT
    (will need to adjust when schema privileges happen), and clean up
    CreateHistTables method to remove old authorization mechanism
    Changed hs_update.cpp which controls the update and showstats operation
    to add authorization checks

    Purgedata and populate index changes:

    Changed CmpSeabaseDDLcommon.cpp to check privileges for purgedata
    Changed CmpSeabaseDDLindex.cpp to check privileges for popindex

    Additional component privileges and checks:

    Added support for new component privileges in PrivMgrMD.h/.cpp
    Added support for MANAGE_COMPONENTS
    Added support for CREATE_INDEX and DROP_INDEX component privs

    Fixes from last delivery that were postponed:

    Context.cpp - fix for previous code review
    CmpSeabaseDDLtable - added calls to deallocEHI
    PrivMgrMD - fixed wording in a comment

    Miscellaneous changes:

    ComUser - added new convenience method - isRootUserID()
    NATable.cpp (setupPrivInfo)  to always set up privInfo_ and to call
    the embedded compiler while extracting privileges
    Privilege adjustments to take advantage of privInfo stored in NATable:
    Added code to mark and rewind errors in diags.

    Fix for LP bug 1392895

Change-Id: I6f7245ae7e66086769c0e92d901399c99e8f2af3
Merge "Authorization checks for DDL & utilities"