test: decrease instance file name length

The maximal unix socket file length is 108 symbols on Linux, so
we should decrease file name to fit in this size.

test/box/gh-5304-insert_during_recovery.result

@@ -8,7 +8,7 @@ test_run = env.new()
  | ---
  | ...
 
-test_run:cmd('create server test with script="box/gh-5304-insert_during_recovery.lua"')
+test_run:cmd('create server test with script="box/insert_during_recovery.lua"')
  | ---
  | - true
  | ...

test/box/gh-5304-insert_during_recovery.test.lua

@@ -3,7 +3,7 @@
 env = require('test_run')
 test_run = env.new()
 
-test_run:cmd('create server test with script="box/gh-5304-insert_during_recovery.lua"')
+test_run:cmd('create server test with script="box/insert_during_recovery.lua"')
 test_run:cmd('start server test with args="none"')
 test_run:cmd('switch test')
 s1 = box.schema.space.create('temp', {temporary=true})

test/box/gh-5304-replace_during_recovery.result

@@ -8,7 +8,7 @@ test_run = env.new()
  | ---
  | ...
 
-test_run:cmd('create server test with script="box/gh-5304-replace_during_recovery.lua"')
+test_run:cmd('create server test with script="box/replace_during_recovery.lua"')
  | ---
  | - true
  | ...

test/box/gh-5304-replace_during_recovery.test.lua

@@ -3,7 +3,7 @@
 env = require('test_run')
 test_run = env.new()
 
-test_run:cmd('create server test with script="box/gh-5304-replace_during_recovery.lua"')
+test_run:cmd('create server test with script="box/replace_during_recovery.lua"')
 test_run:cmd('start server test')
 test_run:cmd('switch test')
 s0 = box.schema.space.create('test')