Bug 6639

Issue description:

The issue is that the developer who demand only the "new" software
they write is allowed to be compiled from source, they only want to
reuse binaries from an existed sstate-cache, if the developer makes
a change that triggers a rebuild, it should be an instant error. 

The purpose of this is for the sstate-cache to check if the item
exists or not. If it doesn't the item needs to be in a whitelist
or we need to fail.


Test steps:
1) Create a sstate cache for testing
$ bitbake db

2) Add gzip to SSTATECACHE_WHITELIST, it enabled read-only sstate-cache,
vim local.conf
...
SSTATECACHE_WHITELIST = 'gzip'
...

3) Remove tmp dir and build db from sstate-cache succeed
$ mv tmp tmp-back && bitbake db

4) tweak db's do_configure task by adding comments
--- a/meta/recipes-support/db/db_6.0.30.bb
+++ b/meta/recipes-support/db/db_6.0.30.bb
@@ -27,6 +27,8 @@ LIC_FILES_CHKSUM = "file://../LICENSE;md5=1ec8b0b17cc31513fe35ab10716f8490"
@@ -82,6 +84,7 @@ do_configure() {
        gnu-configize --force ${S}
        export STRIP="true"
        oe_runconf
+       echo "hello"
 }

5) build db and there is a build failure
$ bitbake db

6) clean db and there is a clean failure
bitbake db -ccleansstate

7) Append the missing recipe's PN to SSTATECACHE_WHITELIST
vim local.conf
...
SSTATECACHE_WHITELIST = 'gzip db rpm-native gcc-runtime eglibc linux-libc-headers libgcc'
...

8) Build db and clean db succeed
$ bitbake db && bitbake db -ccleansstate