; Move some Eshell tests to more-topical files

; Move some Eshell tests to more-topical files

eshell-tests.el should mainly be for code in eshell.el.

* test/lisp/eshell/eshell-tests.el (eshell-test/pipe-headproc)
(eshell-test/pipe-tailproc, eshell-test/pipe-subcommand)
(eshell-test/pipe-subcommand-with-pipe)
(eshell-test/subcommand-reset-in-pipeline)
(eshell-test/lisp-reset-in-pipeline): Move to...
* test/lisp/eshell/esh-cmd-tests.el
(esh-cmd-test/pipeline-wait/head-proc)
(esh-cmd-test/pipeline-wait/tail-proc)
(esh-cmd-test/pipeline-wait/subcommand)
(esh-cmd-test/pipeline-wait/subcommand-with-pipe)
(esh-cmd-test/reset-in-pipeline/subcommand)
(esh-cmd-test/reset-in-pipeline/lisp): ... here.

* test/lisp/eshell/eshell-tests.el (eshell-test/pipe-headproc-stdin):
Move to...
* test/lisp/eshell/esh-io-tests.el
(esh-io-test/pipeline/stdin-to-head): ... here.