Remove --use-deprecated legacy-resolver flag

The pip team is planning to depreciate the
'--use-deprecated legacy-resolver'install option.
While a firm date has yet to be set, We need to be
ready for the change.

Test Plan*:

PASS: Verified that tox runs without issues
PASS: Generate Vault package.
PASS: Upload and apply Vault package and check if pod
      is running.

Note(*): Tested on kubernetes 1.21.8

Closes-bug:1966076

Signed-off-by: Karla Felix <karla.karolinenogueirafelix@windriver.com>
Change-Id: I582378ff198430c182fd9197976e9041f2910680

python-k8sapp-vault/k8sapp_vault/requirements.txt

@@ -1,2 +1,2 @@
-pbr>=2.0.0
-PyYAML==3.10
+pbr==5.1.3
+PyYAML>=3.13

python-k8sapp-vault/k8sapp_vault/test-requirements.txt

@@ -14,7 +14,7 @@ oslotest>=3.2.0 # Apache-2.0
 stestr>=1.0.0 # Apache-2.0
 testrepository>=0.0.18
 testtools>=2.2.0 # MIT
-tempest-lib<0.5.0,>=0.4.0
+tempest-lib>=0.4.0
 ipaddr
 pytest
 pyudev

python-k8sapp-vault/k8sapp_vault/tox.ini

@@ -21,8 +21,7 @@ sitepackages = False
 whitelist_externals = bash
                       find
 
-install_command = pip install --use-deprecated legacy-resolver \
-    -v -v -v \
+install_command = pip install -v -v -v \
     -c{toxinidir}/upper-constraints.txt \
     -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/openstack/requirements/raw/branch/stable/stein/upper-constraints.txt} \
     {opts} {packages}
@@ -81,8 +80,7 @@ commands =
 
 [testenv:py39]
 basepython = python3.9
-install_command = pip install \
-    -v -v -v \
+install_command = pip install -v -v -v \
     --use-deprecated legacy-resolver \
     -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/starlingx/root/raw/branch/master/build-tools/requirements/debian/upper-constraints.txt} \
     {opts} {packages}