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Step 2 of 2 to disallow terminal from spawning crosh.
* crrev.com/c/2094066
* crrev.com/c/2089558

Adds a new terminalPrivate.openVmshellProcess function
which is to be used by terminal.  This function can
open vmshell, but not crosh.

Terminal CL must be landed first which supports calling
either openVmshellProcess or openTerminalProcess.

Bug: 1056049
Change-Id: I0e4b54741aafcb3d6683f8ec668e94eaeec78ce8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2089558Reviewed-by: Jason Lin <lxj@google.com>
Reviewed-by: Ben Wells <benwells@chromium.org>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749032}