travis: use cap sys_ptrace instead of unconfined
travis: use cap sys_ptrace instead of unconfined

Rather than disabling secomp, just use cap ptrace.

Signed-off-by: William Roberts <60148e894dabf0b83bde1d460768794cd453c455@intel.com>

01org/tpm2.0-tools,01org/tpm2.0-tools,01org/tpm2.0-tools