[MEXT] New Text for home link detection in RFC3775bis

The WG had consensus to fold in text from draft-krishnan-mext-hld into 
RFC3775bis. Here is the proposed text for doing so. Feel free to edit.

This change is made in Section 11.5.4

OLD TEXT
========
    A mobile node detects that it has returned to its home link through
    the movement detection algorithm in use (Section 11.5.1), when the
    mobile node detects that its home subnet prefix is again on-link.

NEW TEXT
========
    When an MN detects that it has arrived on a new link using the
    movement detection algorithm in use (Section 11.5.1) it performs the
    following steps to determine if it is on the home link.

    o  The MN performs the procedure described in Section 11.5.2 and
       configures an address referred to as the Current MN Address (CMA).
       It also stores all the on-link prefix(es) received in the RA along
       with their prefix lengths in a conceptual list called the Current
       Link Prefix List (CLPL).

    o  If the home prefix has been statically pre-configured on the MN
       it checks if the home prefix matches one of the prefixes in the
       CLPL. If it does, the MN concludes that it has returned home.

    o  If the home prefix has not been statically configured the MN uses
       some form of bootstrapping procedure (e.g. RFC5026) to determine
       the home prefix. It then checks if the home prefix matches one of
       the prefixes in the CLPL. If it does, the MN concludes that it has
       returned home.

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