test/ctr_seccomp.bats: unify common code
test/ctr_seccomp.bats: unify common code

Move the common code executed before each test to setup().

While at it,

 - unify sed statements into one invocation;
 - remove exports (they are not needed);
 - set CONTAINER_* env vars only for start_crio;
 - fix excessive quoting

This fixes a bunch of shellcheck warnings like this:

> In ctr_seccomp.bats line 125:
> 	export CONTAINER_SECCOMP_PROFILE=""$TESTDIR"/seccomp_profile1.json"
>                ^-----------------------^ SC2030: Modification of CONTAINER_SECCOMP_PROFILE is local (to subshell caused by @bats test).
>                ^-----------------------^ SC2031: CONTAINER_SECCOMP_PROFILE was modified in a subshell. That change might be lost.
>                                            ^------^ SC2027: The surrounding quotes actually unquote this. Remove or escape them.

Signed-off-by: Kir Kolyshkin <3a017b8ddb3f9cf3e4a59978b004111bdeb97f08@gmail.com>

nalind/cri-o,nalind/cri-o,nalind/cri-o,kubernetes-incubator/ocid,kubernetes-incubator/ocid,kubernetes-incubator/cri-o,kubernetes-incubator/cri-o,kubernetes-incubator/cri-o,kubernetes-incubator/cri-o,kubernetes-incubator/ocid