Zygote: Increase wrap-pid timeout to thirty seconds

Some lowend devices under heavy instrumentation may not be able to
send the pid in the current five seconds. Drop the safety and
ignore watchdog debug builds, and move the timeout to thirty seconds.

Make the ZygoteConnection constants sharable in their own @hide class.
Add an assert into the watchdog that the wait time is less than the
watchdog time on non-debug builds.

Bug: 63904739
Bug: 63638768
Test: m
Test: manual test
Test: cts-tradefed run commandAndExit cts-dev -m CtsWrapWrapDebugTestCases
Change-Id: I80abdda54cd94e935de5a52b9f3c9192d0e31060