Allow all exceptions to indicate system is offline (#95)

Pinging a QEMU virtual system doesn't work for detecting the system
going offline, so the ping was removed from both the offline and online
path of the test cases. However, this broke testing with real system.

Allow all exceptions to signal system not available when waiting for
online or offline.

Fixes #94 

- [x] Impacts functionality?
- [ ] Impacts security?
- [x] Includes tests?
- [ ] Includes documentation?

## How This Was Tested

Tested on the QEMU path and a physical system.

## Integration Instructions

N/A

Co-authored-by: Doug Flick <[email protected]>

DfciPkg/UnitTests/DfciTests/Support/Robot/DFCI_Shared_Keywords.robot

@@ -182,7 +182,7 @@ Reboot System And Wait For System Online
 
         TRY
             ${reboot_complete}=  is_reboot_complete
-        EXCEPT  Connection to remote server broken  type=start
+        EXCEPT
             ${reboot_complete}=  Set Variable  ${False}
             BREAK
         END
@@ -198,7 +198,7 @@ Reboot System And Wait For System Online
 
         TRY
             ${reboot_complete}=  is_reboot_complete
-        EXCEPT  Connection to remote server broken  type=start
+        EXCEPT
             ${reboot_complete}=  Set Variable  ${False}
         END
     END