test: Get along with /usr/local/bin/cockpit-bridge

This happens in the pybridge scenario once image-customize changes to
installing wheels into /usr/local [1]. We need while loops to cover all
installed "cockpit-bridge" commands.

[1] cockpit-project/bots#4397

test/verify/check-connection

@@ -153,15 +153,15 @@ class TestConnection(MachineCase):
             self.allow_journal_messages(".*cockpit-session: bridge program failed.*")
 
             # pretend cockpit-bridge is not installed, expect specific error message
-            m.execute("mv /usr/bin/cockpit-bridge /usr/bin/cockpit-bridge.disabled")
+            m.execute("while B=$(command -v cockpit-bridge); do mv $B ${B}.disabled; done")
             b.open("/system")
             b.wait_visible("#login")
             b.set_val("#login-user-input", "admin")
             b.set_val("#login-password-input", "foobar")
             b.click('#login-button')
             b.wait_visible('#login-fatal-message')
             b.wait_text('#login-fatal-message', "The cockpit package is not installed")
-            m.execute("mv /usr/bin/cockpit-bridge.disabled /usr/bin/cockpit-bridge")
+            m.execute("while B=$(command -v cockpit-bridge.disabled); do mv $B ${B%.disabled}; done")
 
         # Lets crash a systemd-controlled process and see if we get a proper backtrace in the logs
         # This helps with debugging failures in the tests elsewhere

test/verify/check-loopback

@@ -37,7 +37,7 @@ class TestLoopback(MachineCase):
         b.logout()
         b.wait_visible("#login")
 
-        m.execute("rm /usr/bin/cockpit-bridge")
+        m.execute("while B=$(command -v cockpit-bridge); do rm $B; done")
         b.set_val('#login-user-input', "admin")
         b.set_val('#login-password-input', "foobar")
         b.click('#login-button')