Make possible to pass startup options to PS servers for --test_mode

[ShahriyarR]

The idea is:

• Make possible to pass startup/initialize options for PS servers. For eg,

innodb_buffer_pool_size = 1G 2G 3G
innodb_log_file_size = 1G 2G 3G
innodb_page_size = 4K 8K 16K 32K 64K

So the work flow should be:

• Start/initialize PS server from the option combinations which will be generated:

innodb_buffer_pool_size = 1G
innodb_log_file_size = 1G
innodb_page_size = 4K

Run becnhmark, Take backup of this server and prepare and restore.

Then continue such:

innodb_buffer_pool_size = 1G
innodb_log_file_size = 2G
innodb_page_size = 8K

And so on. This will cover possible MySQL options interactions with XtraBackup.

[ShahriyarR]

I have changed an idea for passing MySQL options:
--innodb_buffer_pool_size=1G 2G 3G,--innodb_log_file_size=1G 2G 3G,--innodb_page_size=4K 8K 16K 32K 64K -> this one actually more robust solution.

[ShahriyarR]

Basically, what I am going to do, to create list of option combinations then:

• go through this list,
• initialize/start MySQL with those options
• backup
• prepare
• recover

And repeat this action for all option combinations

[ShahriyarR]

Here is the draft code for option combinations creation:
https://repl.it/MxCc/6

[ShahriyarR]

Options are generated properly now, based on PS version:

$ cat xb_2_3_ps_5_6.conf | grep mysql_options
mysql_options = --innodb_buffer_pool_size=1G 2G 3G,--innodb_log_file_size=1G 2G 3G,--innodb_page_size=4K 8K 16K

$ cat xb_2_4_ps_5_6.conf | grep mysql_options
mysql_options = --innodb_buffer_pool_size=1G 2G 3G,--innodb_log_file_size=1G 2G 3G,--innodb_page_size=4K 8K 16K

$ cat xb_2_4_ps_5_7.conf | grep mysql_options
mysql_options = --innodb_buffer_pool_size=1G 2G 3G,--innodb_log_file_size=1G 2G 3G,--innodb_page_size=4K 8K 16K 32K 64K

[ShahriyarR]

I have decided to change the logic of calling tests.
For this purpose, I have created new bats file called prepare_env.bats, which is going to prepare whole test environment with much more granular output.
After running this file, we could run tests on this.

[ShahriyarR]

So according test run and the results this issue implemented fully.

$ ls backup_dir/
ps_5_6_x_2_3  ps_5_6_x_2_4  ps_5_7_x_2_4

Merging to release_v1.4.9