classes/sstate: handle filenames containing square brackets

If a recipe installs a file or directory whose name contains square
brackets [ ] that form a valid glob expression and that file then they
won't be correctly removed from the sysroot, because we pass each path
in the sstate manifest to our oe.path.remove() function which calls
glob.glob() on the path passed into it and the expression won't
actually match the original filename. Since we don't expect to put any
wildcarded expressions in the sstate manifests, and we already have a
try...except around this, we can actually use os.remove() here instead.

Similarly, when we pass existing file paths to "grep" looking through
the manifests, we don't want those paths to be treated as regexes - so
use grep's -F command line switch.

Fixes [YOCTO #10836].

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>

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