test: Remove bond tests tag expfail

Since the root cause of the bond tests failure is already found and
fixed (by the commit 'fix: Add dhcp client package dependency for
initscripts provider'). Therefore, remove the bond tests tag `expfail`
and enable the bond tests in the downstream testing.

Signed-off-by: Wen Liang <liangwen12year@gmail.com>

tests/playbooks/tests_bond.yml

@@ -2,8 +2,6 @@
 ---
 - name: Play for testing bond connection
   hosts: all
-  tags:
-    - tests::expfail
   vars:
     controller_profile: bond0
     controller_device: nm-bond

tests/playbooks/tests_bond_cloned_mac.yml

@@ -2,8 +2,6 @@
 ---
 - name: Play for testing bond cloned MAC address
   hosts: all
-  tags:
-    - tests::expfail
   vars:
     controller_profile: bond0
     controller_device: nm-bond

tests/playbooks/tests_bond_deprecated.yml

@@ -2,8 +2,6 @@
 ---
 - name: Play for testing bond device using deprecated 'master' argument
   hosts: all
-  tags:
-    - tests::expfail
   vars:
     controller_profile: bond0
     controller_device: deprecated-bond

tests/playbooks/tests_bond_options.yml

@@ -2,8 +2,6 @@
 ---
 - name: Play for testing bond options
   hosts: all
-  tags:
-    - tests::expfail
   vars:
     controller_profile: bond0
     controller_device: nm-bond

tests/playbooks/tests_bond_removal.yml

@@ -2,8 +2,6 @@
 ---
 - name: Play for testing bond removal
   hosts: all
-  tags:
-    - tests::expfail
   vars:
     controller_profile: bond0
     controller_device: nm-bond