[Tracker] need to rebuild index if watched dir or ignore rule is changed

[Jerry Tan <Jerry Tan Sun COM>]

Hi, jamie,
after I check in the patch for ignore filename pattern,
I notice that I have to rebuild index to make it take affect.

But in TP, if user change setting for watch directories, or ignore files,
trackerd is restarted, but without "-R" param,
that's not right.


User will find that, if he set rules to ignore some file ,
but he still can find them in the TST tools.
that's wired.

so my suggestion:
If user change watched dir or anything in ignored files tab,
trackerd need to be restarted with "-R".