Remove centos bootstrap private key

We can freely remove id_rsa for centos bootstrap, because:
1. CentOS bootstrap was deprecated and removed in 9.0 fuel;
2. Related fix (which stores backward compatibility to early
   fuel versions) was merged to fuel-devops tool [1, 2]

[1]. https://review.openstack.org/#/c/280625/
[2]. https://review.openstack.org/#/c/306994/

Change-Id: I5e34160f72a46fd9bec46304ed0c381d82c4b220
Closes-Bug: #1575558

bootstrap/ssh/id_rsa

@@ -1,27 +0,0 @@
------BEGIN RSA PRIVATE KEY-----
-MIIEpAIBAAKCAQEA7a1U0jPLRneBPJISZ9oHzf9n8pp1/9GCgBklWU1gzSHGC+c1
-05UsK3HJ//BIJpzbCTcbnCUU/qFqqwxmhWnobsJWPyAapudCiVWlK+UGMzlKalaR
-SKaF91MBEwsXEgdS4kGGwr6yXKjj0OGbvXzITBimgF9aIczrpp+HM7iw2CLwpz56
-FOUQ1re4NRmhRZcxlNyRaKI+/2lhSTKiS4p72st769rxaQbztctvZyrvs4KWZM8y
-QnNJ3aFarwflvQ2OkLYE0ln3d2RP/L4OIfEFfB/scai/7lgsQ5L9mN674gB4r0f1
-ftWAkkB9DQSazUpEY3fta6C4XBBk+/2BJ24FVQIDAQABAoIBAHbFfXOlqllGcvC/
-1i7Lh8brcRiNE5aJLfuxlTZxMoSP8hYUrpNTIkV7kYQyoPuauuJ6BXQcG8e7BkD/
-62OULzDaMJtPAcKSIm/aurWat2R1prhJFkUF4kBb3FeV3SuHOWYTdLJw9VTUmTPS
-6i7g4n8UenAANlxZuREE+11fWBBJPwmcStwGq9qVn+SydLsSxU0g8cGqd+edYV2p
-zBINA88iEkEAQzmK8Pmm9Dqbf5trnSGjqe5tkqxV1CEvb3LcIkxlJgMaWoJNF5ip
-Ajl/+WD16xEqbSnr9fAkKXdPbZJW9dPckC6gxeiRx2TXl44XXGX6phv/JUzb+b5n
-in+lG0ECgYEA+T6CnPKcKnEO+82Kj14vt+UMZADCDN9i42kodwYJSLlQljiAYRhq
-/SmjSNV0A77udpKtN/VFkpssRxFiuazOL4IVJyoQnYNRC0Mov6yexYsejmW7B6xd
-YPvPkFPShSMXR16l0Qs0K3sE2QvsNHqzF+mOyriCturF/sjQATrBQgkCgYEA9B6O
-xdpfudjh+3/Jx03a4SqQ8r5n6hG56SUJi7dfCpt8Sx94vBsoHThog9u132D47OR2
-9xyL3kwhbux1IAn3UpvR07pjKlwSsNlIjeU5lrdWqfxwjf9XLI08/yaeJYDzamsF
-EkaxGjxFeXXe2W9pZQ8wCH4kC7K5DI3PrOyhi+0CgYEA2tDGWoOkFp6rSOVqf/Nw
-cUHlXuZLdoGnj38Cx3vFKtOGrFtuWc/WHewwLgE3mRJGyFJ9QGNUcSFJ/hqFUf0k
-BxFtALUtYRuoSvrrC1vBCCza5qjpShNI55wq3cq5R6lHBqFRcfUkGAgoeWS+OlR+
-Zr/lXJQgLfZvXP9vnaS3hgECgYBDiUywehivnsvuO01EgUqDrrYJIho3jI3lbWS1
-rZZypc9+LQfG6rBvXRK1IAyx7u8PAqnS9afQaTl6qZpBseAlj4w+SjtzFaPqH0LO
-VtNW2gP05Szya+jfH3f3kuR/tawiDdeKVdpbSr9hufVcLFF5Lvl38AXi4qAFVBpX
-WePbhQKBgQDl0Y0Nzj4zKb+tD3+Cg8/c0xLGqiyKoX+87c9Dru+aWudfZEjrwi2F
-Ui3iN31rrEl+OqwJnC4gR+hWuDuF9gVMb17GoiM/fcvgzes9NL1YWFeKHU8ZKRox
-w3nxStHyiETfTyC9LOS1JCfFIMcpYD0lFuHnQHib/HX3dmUvbqo77Q==
------END RSA PRIVATE KEY-----

specs/fuel-main.spec

@@ -41,8 +41,6 @@ mkdir -p %{buildroot}/etc/yum/vars/
 mkdir -p %{buildroot}/etc/yum.repos.d
 echo %{fuel_release} > %{buildroot}%{_sysconfdir}/fuel_release
 echo %{fuel_release} > %{buildroot}%{_sysconfdir}/yum/vars/fuelver
-install -D -m 700 -d %{buildroot}/root/.ssh
-install -p -m 600 %{_builddir}/%{name}-%{version}/bootstrap/ssh/id_rsa %{buildroot}/root/.ssh/bootstrap.rsa
 # copy GPG key
 install -D -m 644 %{_builddir}/%{name}-%{version}/fuel-release/RPM-GPG-KEY-mos %{buildroot}/etc/pki/fuel-gpg/RPM-GPG-KEY-mos
 # copy yum repos and mirror lists to /etc/yum.repos.d
@@ -56,7 +54,7 @@ rm -rf %{buildroot}
 
 %files
 %defattr(-,root,root)
-/root/.ssh/bootstrap.rsa
+
 
 %package -n fuel-release