Do not use abosolute path for ifconfig in BATs

It may not be where we expect, but should be on the PATH
Signed-off-by: caleb miles <cmiles@pivotal.io>

bat/spec/system/network_configuration_spec.rb

@@ -86,7 +86,7 @@ describe 'network configuration' do
       expect(bosh("deployment #{deployment.to_path}")).to succeed
       expect(bosh('deploy')).to succeed
 
-      expect(ssh(public_ip, 'vcap', '/sbin/ifconfig', ssh_options)).to include(second_static_ip)
+      expect(ssh(public_ip, 'vcap', 'ifconfig', ssh_options)).to include(second_static_ip)
     end
 
     it 'deploys multiple manual networks' do
@@ -99,8 +99,8 @@ describe 'network configuration' do
       expect(bosh("deployment #{deployment.to_path}")).to succeed
       expect(bosh('deploy')).to succeed
 
-      expect(ssh(public_ip, 'vcap', '/sbin/ifconfig', ssh_options)).to include(static_ips[0])
-      expect(ssh(public_ip, 'vcap', '/sbin/ifconfig', ssh_options)).to include(static_ips[1])
+      expect(ssh(public_ip, 'vcap', 'ifconfig', ssh_options)).to include(static_ips[0])
+      expect(ssh(public_ip, 'vcap', 'ifconfig', ssh_options)).to include(static_ips[1])
     end
   end
 end

bosh-stemcell/spec/os_image/centos_7_spec.rb

@@ -75,7 +75,7 @@ describe 'CentOS 7 OS image', os_image: true do
     end
 
     describe file('/usr/sbin/ifconfig') do
-    	it { should be_executable }
+      it { should be_executable }
     end
   end