Fix exponential regex performance issue

filter_leading_non_json_lines effectively does

re.match(".*\w+=\w+.*", line)

for every line of output. This has abysmal performance in case of large
Base64-encoded data (which ultimately does not match the regex but does
match the .*\w+= part) as returned e.g. by the template module (diffs).

Replacing the match with

re.search("\w=\w", line)

drops the complexity back to linear, and actually usable with large
diffs from the template module (a 150 KB Base64 diff kept Ansible
spinning at 100% cpu for minutes).

Also, check the easy cases (line.startswith) first while we're here.

Closes: #8932
Adding test Coverage for mysql_variable module

Use mysql_variable to query, set and update variables.
Assert using user and password to query, set and update  variables.
Assert using single quotes, double quotes and no quotes  when using variables
Add support for environment variables in GCE module.
Update our search code for the doc site.
Update version.
Merge pull request #8397 from lukesneeringer/gce-envvars

Add support for environment variables in GCE module.
Merge pull request #8398 from wrosario/integration_mysql_variables

Adding test Coverage for mysql_variable module
Merge pull request #8400 from nicocesar/devel

"allow_no_value=True" for ini_file module
Merge pull request #8405 from wenottingham/patch-2

Update version.
Add version_added attribute for regexp parameter.
Merge branch 'bug8392' of git://github.com/gnosek/ansible into devel
Add some whitespace to make paramiko_ssh more browseable
Use atomic move function on known host file in paramiko to prevent rare occurance of Control-C
during file operations.
Remove unnecessary unicode conversions from parse_kv

Fixes #8425
Revert ""allow_no_value=True" for ini_file module so /etc/my.cnf can be read without a problem"

This reverts commit cbdc9f1153e665fe0e62a11ed7c244adb83ecbd9.

Code needs to make allowances for particular python versions and try/except
around this block.
Fix literal block multiline parsing

Fixes #8394
Revert "Use atomic move function on known host file in paramiko to prevent rare occurance of Control-C"

This reverts commit 642b183fb6b0632167130774c2ebfc44d88ac278.
Require python-crypto >= 2.6 for debian package builds

The ansible PyPi package, and RPM both require crypto>=2.6.  This change
carries that dependency into the ansible DEB package.  Note, for
ubuntu-12.04, this dependency is only satisfied by a PPA.  Users
installing from 'ppa:ansible/ansible' will not be affected..
Merge branch 'devel' of https://github.com/ansible/ansible into devel

Conflicts:
	library/files/ini_file
resolving conflicts