Rename roles according to ansible recommendations

nvidia-driver/meta/main.yml

@@ -1,3 +0,0 @@
----
-dependencies:
-  - {role: rpmfusion-nonfree-repo}

nvidia_driver/meta/main.yml

@@ -0,0 +1,3 @@
+---
+dependencies:
+  - {role: rpmfusion_nonfree_repo}

rpmfusion-nonfree-repo/meta/main.yml

@@ -1,3 +0,0 @@
----
-dependencies:
-  - {role: rpmfusion-free-repo}

rpmfusion_free_repo/meta/main.yml

@@ -1,8 +1,8 @@
 ---
 dependencies:
-  - role: epel-repo
+  - role: epel_repo
     when: ansible_distribution != 'Fedora'
-  - role: powertools-repo
+  - role: powertools_repo
     when:
       - ansible_distribution != 'Fedora'
       - ansible_distribution_major_version|int >= 8

rpmfusion_nonfree_repo/meta/main.yml

@@ -0,0 +1,3 @@
+---
+dependencies:
+  - {role: rpmfusion_free_repo}