Mark eventtest as a known failure in amd64

Issue #29

eventtest exceed the default time limit in amd64

Signed-off-by: Junjie Mao <eternal.n08@gmail.com>
Mark eventtest as a known failure in amd64

Issue #30

pipetest panics in amd64:

user panic at tests/pipetest.c:85:
    assertion failed: total == len && strcmp(buf, msg) == 0

Signed-off-by: Junjie Mao <eternal.n08@gmail.com>