made TerminateNicely go agent test more deterministic

Signed-off-by: Maria Shaldibina <mariash@pivotallabs.com>
rename exec_cmd_runner fixtures

Signed-off-by: Maria Shaldibina <mariash@pivotallabs.com>
skip output truncation test for ruby agent

Signed-off-by: Maria Shaldibina <mariash@pivotallabs.com>
backfill few err test cases

Signed-off-by: Maria Shaldibina <mariash@pivotallabs.com>
Wait for file server to start in upload release tests

Signed-off-by: Maria Shaldibina <mariash@pivotallabs.com>
Formatting

Signed-off-by: Maria Shaldibina <mariash@pivotallabs.com>