Use named pipes for logshifter redirection where appropriate

Use named rather than anonymous pipes for cartridges whose processes
can't do internal pidfile management. When using process substitution,
the intermediate Bash interpreter which drives the anonymous pipes
results in dangling file descriptors in the intermediate Bash, causing
readers (such as oo_spawn) to block on IO select calls.

Using named pipes manually removes the unnecessary intermediate Bash.
Merge pull request #5201 from ironcladlou/logshifter-pipes

Merged by openshift-bot