keytests: Add more controls for the *-in.txt files

keytests: Add more controls for the *-in.txt files

The controls are described in hello-world-in.txt as
Cr: not expected regex search pattern before next expected match
Cp: not expected search pattern before next expected match

See also findadv-re-04-in.txt for an example
In this test-case, searching for case sensitive and format considering
search is failing.