Move qubes.WaitForSession to shared qrexec package

It is also used by dom0, to avoid duplication, merge into a single
package.

For: QubesOS/qubes-notification-proxy#13
For: QubesOS/qubes-gui-agent-linux#251
For: QubesOS/qubes-core-admin#757
For: QubesOS/qubes-issues#1512
For: QubesOS/qubes-issues#9940
Fixes: QubesOS/qubes-issues#10443

Author: ben-grande

debian/qubes-core-agent.install

@@ -37,7 +37,6 @@ etc/qubes-rpc/qubes.VMRootShell
 etc/qubes-rpc/qubes.VMExec
 etc/qubes-rpc/qubes.VMExecGUI
 etc/qubes-rpc/qubes.VMRootExec
-etc/qubes-rpc/qubes.WaitForSession
 etc/qubes-rpc/qubes.WaitForRunningSystem
 etc/qubes-rpc/qubes.WaitForNetworkUplink
 etc/qubes-rpc/qubes.GetDate

qubes-rpc/Makefile

@@ -78,7 +78,6 @@ install:
 		qubes.SuspendPre qubes.SuspendPost qubes.GetAppmenus \
 		qubes.SuspendPreAll \
 		qubes.SuspendPostAll \
-		qubes.WaitForSession \
 		qubes.WaitForRunningSystem \
 		qubes.WaitForNetworkUplink \
 		qubes.DetachPciDevice \

qubes-rpc/qubes.WaitForSession

@@ -911,7 +911,6 @@ rm -f %{name}-%{version}
 %config(noreplace) /etc/qubes-rpc/qubes.SuspendPreAll
 %config(noreplace) /etc/qubes-rpc/qubes.SuspendPost
 %config(noreplace) /etc/qubes-rpc/qubes.SuspendPostAll
-%config(noreplace) /etc/qubes-rpc/qubes.WaitForSession
 %config(noreplace) /etc/qubes-rpc/qubes.WaitForRunningSystem
 %config(noreplace) /etc/qubes-rpc/qubes.WaitForNetworkUplink
 %config(noreplace) /etc/qubes-rpc/qubes.DetachPciDevice